DESCRTPTTONS OF NEW DECAPOD CRUSTACEANS FROM THE WEST COAST OF NORTH AMERICA. By Mary J. Ratiibun, Second Assistant Curator, /)/vv>/o« of Marine Invertebrates. The species and subspecies here described are the result chietiy of a study of the vast collection of shrimps from the coast of Alaska south- ^vard to San Dieo-o, CalifoT'nia, which have been accumulatin<>' for many years iti the ITnited Statt^s National Museum, and have been obtained laroely In" the I'nited States Fish Conunission steamer A/hfffross. Resides the siu-imps, one new crab, an Oregonia^ was dredo-ed bv the AJhutros.s (\\\y\\\^ her cruise in Bcrinof Sea in 1900. In comiection with the ])ublication of the Decapod Crustacea of the Hai'riman Expedition, it is proposed to give a list of the foi"ms known to inhabit i\\v coast of western America (north of Mexico) and to nioit' fully desci'il»(' and figure the new and little-known species. Family MAHDiE. OREGONIA BIFURCA. Surface tuberculate and hairy. Postorbital width two-thirds of branchial width. Rostral horns diverj»-ent from their base. Basal joint of antenna armed on its outer edoe with a stout l)lunt subter- iniiial spine and three small spines, one of which is at the anterior anulc. Inner surface of merus of chelipeds bordered by short blunt spines; propodus sli«jhtly lonyer than merus, tinj^crs and palm sub- ecpial. marnins of palm sul)parallel. Dactyli of ambulatory ley's con- tained al)out one and a third tinu^s in their propodi. Pliinn.'-tionx. — Lenijth of carapace" and rostrum 20.5 mm., width of carapace \\)A\ nun., width between tips of postorbital spines 13 mm., leneth of hoin measured alon^r the inner edge 8.1 nun., distance between tips of horns I'..;") mm. Type locallti/. — One specimen only, a female, was taken b}' the U. S. Fish (^onunission steamiM- Alhaiross at station 8785, north of Rat Islands, Aleutians. i'7(» fathoms (Cat. No. 25287). Proceedings U. S. National Museum. Vol. XXIV— No. 1272. 885 886 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. Family CALLIANASSID^. CALLIANASSA GONIOPHTHALMA. Closely allied to C. csecigena Alcock and Anderson. Rostrum reaching barely one-third the length of the eyes. No median carina, but a slight blunt elevation near the posterior margin corresponding to the strong tooth in C. cxcigena. Eyes oblong, sides subparallel, reaching nearly to end of first antennular segment. Chelipeds of the first pair shaped as in C. cs&cigena^ but the carpus of the larger one is devoid of a spine, the palm is not serrated on its lower margin, its outer surface has a few tubercles irregularly disposed on the distal lower quarter; the pollex has on the cutting edge a stout tooth which is nearer the middle than in C. ceecigena. The second to fifth seg- ments, inclusive, of the abdomen are without spines, the telson has subparallel side margins. Dimensions. — Length of carapace of male 30.5 mm., of abdomen 67.5 mm. Type locality. — Off Point Conception, California, 278 fathoms, sta- tion 3198, U. S. Fish Commission steamer Albatross., one male (Cat. No. 25238). Distribution. — Also dredged in 322 fathoms in Clarence Strait, Alaska, station 3077. Family AXllD^. AXIUS SPINULICAUDA. Gastric region traversed b}'^ five carinas, all of which fade out before reaching the cervical groove; the median extends along basal third of rostrum and is armed with four spines; the outer carinas are a continua- tion of the side margins of the rostrum, and are unarmed, as are also the shorter intermediate carina). Surface covered with rather distant scabrous granules. Rostrum reaches middle of second joint of anten- nular peduncle, is sharp-pointed, and has five spines on one side and six on the other. Second segment of antennular peduncle a little longer than the third, both together shorter than the first. The scaphocerite projects as far as the middle of the second segment of the antennula, the stylocerite to end of penult joint of antennal peduncle. First pair of chelipeds missing. Abdomen smooth above; pleura sculptured and pubescent; telson elongate, subquadrilateral, lateral margins spinulous, dorsal surface with a few spines; swimmerets spinulous. Dimensions. — Female, length of carapace and rostrum 19.6 mm., rostrum 3.5 mm., abdomen 31.5 mm. Type locality. — One specimen only, from off Bodega Head, Califor- nia, 62 fathoms, station 3172, U. S. Fish Commission steamer Albatross (Cat. No. 26239). NO. 1272. NE W DECA POD CR USTA CEA NS—RA THB UN. 887 CALASTACUS QUINQUE3ERIATUS. Allied to C. fell.e xVlcock and Anderson. Carapace and rostrum as long as first tive abdominal somites; surface pitted and setose. Rostrum reaches end of second anteniuilar segment, is tipped with a spine, side margins armed with three to seven spines, and prolonged two-thirds the length of gastric region, where they bear five ()!■ six .spines; these prolongations form a horseshoe. Median carina with fi'om two to six spines. Intermediate carina with from three to five spines. P^yes colorless, glol)ular. Stylocerite reaching to distal thii'd of penult joint of peduncle; scaphocerite not I'eaching middle of stylocerite. CUielipeds unecpial, the longer one in the male nearly as long as tiie body. Outer surface of carpus and hand covered with shar}) granules or short spines; upper margin spinous, also lower inner margin of merus; lower outer margin of merus spinous; lower margin of propodus granulous. Margins of propodus subparallel, lingers shorter than palm in adult males, usually slightly gaping at base. Abdomen almost smooth, sides setose. Anterior margin of pleura of third, fourth, and fifth somites, and lower margin of sixth, armed with a small spine. Telson subquadrangular, broadly rounded behind, having a few lateral and one median marginal spine, and two larger dorsal spines. Dimensions. — Male, length of carapace and rostrum 28 nun., of at)domen 41 mm. Ty2>e localitf/.—San Luis Obispo Bay, California, 200 fathoms, sta- tion 8190, U. S. Fish Conmiission steamer Albatross (Cat. JSo. 25240). Dlstrihutlon. — Also taken at six other stations on the coast of southern California, in 1(50 to 888 fathoms. Family TEN^ElDiB. GENNADAS BOREALIS. Allied to G. parum Bate. Rostrum longer, reaching at least half way along the eyestulk, sometimes to the cornea; armed with one tooth. Median carina very distinct nearly to posterior border of carapace. A sharp marginal spine at angle of antero-lateral sinus. The antennal scale projects beyond the antennular peduncle by about the length of the last segment of the peduncle. Chehe of first pair of feet narrow and elongate as in the succeeding pairs. Sixth abdominal somite more than twice as long as fifth, carinate. A small lateral spine at the posterior fourth of the telson. The thelycum diti'ers from that of G. parvm in hnv'mg the transverse plate between the feet of the fourth pair subquadrilateral, narrow in front, and that between the fifth pair fan-shaped, narrow bi>hind, anteriorly rounded, and with 888 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. a blunt median point. The leaves of the andricuni are small and not in contact. Dimensions. — ^Male, lenc^th of carapace and rostrum, 13.6 mm.; of abdomen, 29 mm. TypeJocality. — Off Copper Island, Kamchatka, 1,567 fathoms, station 3783, U. S. Fish Commission steamer MxMtoss (Cat. No. 25211). Distrihution. — Also taken in Bering Sea, north of Rat Islands, Aleutians, 850 fathoms, station 3781. Family CRANGONID^E. Genus CRANGON. a. Group of C. nigricauda, in wJiich tlw carapace lias only one median spine, and the gastric region is not depressed helow the general level. CRANGON ALASKENSIS ELONGATA. Dr. S. J. Holmes, in his very useful Synopsis of California Stalk- Eyed Crustacea,^ has given the S3^nonymy and diagnoses of seven species of Crangon known to occur on the west coast of the United States. 1 would exclude Crangon alaslxensls Lockington from the synonymy of C 7iigricauda Stimpson, and raise it to specific rank, as in a large series of specimens it differs from C. nigriaaudti, in the antennal scale being a little longer and much narrower distally, the extremity of the blade not produced at the antero-internal angle, the spine longer; the first pair of trunk feet shorter; hands more slender, their distal margin more oblique. G. nigricauda ranges from British Columbia to Lower California, C. alaskensis from Bering Sea to Straits of Fuca. Typical C. alaskensis passes b}^ insensible gradations into a form occurring off the coast of California and Oregon in 9 to 53 fathoms, which differs in its longer and narrower rostrum, in the outer anten- nular flagellum falling considerably short of the antennal scale, in the much longer scale, equal to the length of the carapace exclusive of the rostrum, in the fourth segment of the abdomen showing signs of cari- nation, in the telson flattened above, though scarcely grooved, while its tip is more acute than in typical C. aJaske7isls. Dime?isions. — Length of ovigerous female from tip of rostrum to tip of telson, 55.7 mm.; length of carapace, 13.5 mm.; of antennal scale, 11.6 mm. Type locality. — Off Santa Barbara, California, 29 fathoms, U. S. Fish Commission steamer Albatross stations 2970 and 2971 (Cat. No. 25212). CRANGON HOLMESI. Allied to 0. alha Holmes in not having a groove on the under side of the sixth abdominal somite, (iirapace a third as long as abdomen; rostrum short, narrow, triangular, tip rounded. Antennal scale as 1 Occasional Papers of the California Academy of Sciences, VII, 1900. N0.1272. NEW DECAPOD CRUSTACEANS— RATHBUN. 889 lono- oi- Hourly as lojijr as the carapace, exclusive of ro.strum. Maxilli- pcds exceeding scale, antopoiiult segment not dilated. Hand elongate, at)oijt three times as long as wide. f)niir)).^/(»)s. — Ovigei'ous female, length, 23 mm.; of carapace, 5,3 mm.: of antennal scale, 4.2 mm. 'I'l/ J K> local It y.^-OiX ^^'ilmi^gton, California, 27 fathoms, U. S. Fish Commission steamer Alhatroxx station 2t>39 (Cat. No. 25243). CRANGON DALLI. Rostrum long and narrow. Acicle about seven-tenths as lono- as carai)ace, obliciuely subtruncate, inner angle of extremity rounded, leccding. spine extending b(\vond the blade to no greater extent than anterior width of blade. Hands widening from proximal to distal end. distal margin transversely oblicpie. length of palm about two and two-thirds its width. Sixth abdominal somite with two blunt pi'omi- nent carinie, which are the most distinguishing feature of the species. Diuu'nsionn. — Length of ovigerous female, 61,5 nuu.; of carapace, Itl.i! nun. ; ot" scale. 1 l.T) mm. Ti/pc locaiity. — Bering Sea, off Cape Seniavin, Alaska, 30 fathoms, V. S. Fish Commission steamer AIh(itrosi< station 3287 (Cat. No. 25244). Dixtrihution. — One of th(^ most al)undant of Alaskan shrimps. Ranges from Bering Sea to Washington and to Kurile Islands, in 4^ to ♦51 fathoms. CRANGON FRANCISCORUM ANGUSTIMANA. Di tiers from typical C. franciscorum chiefly in the shape of the hands, which are narrower, the difference being greater in the male (lian in the female (in the male the length is five and a half times the width), the dactylus is more longitudinally placed, the pollex is more transverse and nearer the proximal end of the hand. />//y/r//.s'/o;^v.— Length of tVmah^ To.*! mm., of carapace 18.9 mm., of scale 13 nun, Tj/jh' hirallfi/. — Ort' Chuckanuts Island, Bellingham Bay, Washing- ton, 11 fathoius, station 3()12, U. S. Fish Commission ni^ixxwav Albatross (Cat. No. 25245). D/'.strfbut/'o/i. — Kanges from British Columbia to Oregon, in 23 to <>7 fathoms. (/. Group of C conimunis, in irhich thr carapace has two median spines and the gastric region is not depressed bcloir the general level. CRANGON RESIMA. Anterior of median s])i!ies much the smaller. Rostrum advanced beyond eyes, ascending, and ha\ ing, in full-grown individuals, an inftM'ioi- plate, thin, compressed, spatulate. Second segment of anten- ludar peduncle three times as long as third. Hands shorter than in 890 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. C. communis^ three times as lonjr as broad; their anterior margin and also the dactylus, when flexed, are more longitudinal than in C. comfh- munis. Dimensions. — Length of ovigerous female 48.3 mm., length of carapace 12.2 mm., of scale 8.2 mm. Type locality. — Ofi' San Diego, California, 124 fathoms, U. S. Fish Commission steamer Alhatross station 2935 (Cat, No. 25246). Distrihutlon. — Ranges from Monterey Bay, California, to San Domingo Point, Lower California, 44 to 266 fathoms. CRANGON ABYSSORUM. Integument very thin. Anterior of media n spines minute. Rostrum linear, flattened above, acute, ascending at an angle of 30 degrees, below compressed. Eyes very large, hemispherical, inner faces flat and contiguous. Second segment of antennulaj about one and a half times as long as third. Maxillipeds exceeding scale by half length of terminal segment. Manus widening distally, length three times width, dactylus more longitudinal than transverse. Sixth abdominal somite having two prominent dorsal carina? and a short, low, lateral carina. Dimensions. — Length of female 61 mm., of carapace and rostrum 17 mm., of scale 10.3 mm. Type locality. — Bering Sea, southwest of Pribilof Islands, 1,771 fathoms, station 3603, U. S. Fish Commission steamer Albatross (Cat. No. 25247). Distrihution. — Extends from Bering Sea to southern end of Cali- fornia, in 685 to 1,771 fathoms. c. Group of C. munita, in which the gastric region is depressed below the general level of the carapace. CRANGON ACCLIVIS. Compared to O. munita Dana, the lower lateral spine of carapace is further back, the anterior median spine is much larger and farther forward, projecting well in front of the posterior line of the orbits; the rostrum is narrower, ascending at an angle of about 45 degrees, and the anterior margin of the hand is more longitudinal. Dimensions. — Length of male 24.8 mm., length of carapace 7.4 mm., of scale 3 mm. Type locality. — Off Santa Cruz Island, California, 266 fathoms, sta- tion 2948, U. S. Fish Commission steamer Alhatross (Cat. No. 25248). Distrihution. — Dredged from off the Trinity Islands, Alaska, to southern California, 80 to 266 fathoms; scarce. CRANGON VARIABILIS. Like C. munita., but carapace nearly half as long as abdomen, ros- trum convex from behind forward, tip rounded and thickened. Outer NO. 1272. NEW DECAPOD CRUSTACEANS— RATHB UN. 891 mart^in of antennal scale concave. Second to fifth, inclusive, and sometimes the first, somites of abdomen carinated, and except on the first and second tlie carina is usually high, laterally compressed, and blunt. Dimensions. — Female, lenjrth of l)ody 32.2 mm, of carapace 9.2 mm. Type locality. — Oft' North Head, Akutan Island, Alaska, 72 fathoms, station 2842, U. S. Fish Commission steamer AlhatroKK {(^?it. No. 25249). Distrilmtlon. — Ranges from Bering Sea to southern Ca'ifornia, 72 to 184 fathoms. CRANGON SPINOSISSIMA. Compared to C. variahUis., the lower lateral spine of the carapace is more nearly in line with the superior lateral spine; the anterior median spine is larger and farther forward, advancing to a line in front of the l)osterior line of the orbits; rostrum narrower, lon^^er, acute, and more ascending; hand longer and narrower. Dift'ers from all allied -ipecies in having the .somites of the abdomen armed laterall}' with spines. Dimcnfiions. — Female, length of body 36 mm., of carapace 10.5 nmi. Type locality. — Oft" Point Arena, California, 51 fathoms, station 3351, U. S. Fish Commission steamer Albatross (Cat. No. 25250). Distribution. — Off Oregon and California, 51 to 96 fathoms. CRANGON SPINIROSTRIS. Differs from all others of the munita group in having a long sub- erect spiniform rostrum. Anterior median gastric spine similar to the rostrum. Orbital spine slender and ascending, antero-lateral spine diiected upward and outward. Third, fourth, and fifth abdominal .somites carinated. Dimensions. — Female, length of body 35.4 mm., of carapace 10.5 nun. Type locality. — North of Unalaska, 399 fathoms, station 3329, U. S. Fish Commission steamer Albatross (Cat. No. 25251). SCLEROCRANGON ALATA. A small species allied to S. boreas. Carapace onl}^ slightly broader than long, surface sculptured and pitted, two spines and a tubercle on MKMlian carina. Antero-lateral angles broadly alate. Spine of antennal scale advanced as far as or farther than the blade. Hand less than twice as long as broad. Abdominal pleuia without spines. Dimensioihs. — Male, length 38 mm., length of carapace 11 nun., width at branchial spine 10.7 nun. Type locality. — Admiralty Inlet, Puget Sound, 40 fathoms, station 2865, U. S. Fish Commission steamer Albatross (Cat. No. 25252). Distribution. — From Bering Sea to Puget Sound, 6 to 91 fathoms. 892 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. NECTOCRANGON DENTATA. Differs from W. lar (Owen), with wliich it has been confused, in the carinas of the sixth abdominal somite ending in a small sharp tooth or spine, and the more elongate hand, which is about five or more than five times as long as its width across the palm. Dimensions. — Female, length of body 73 mm., of carapace 19 mm., of hand 10 mm., width of palm 2.1 mm. Type locality. — Off Sitkalidak Island, Alaska, 69 fathoms, station 2855, U. S. Fish Commission steamer Albatross (Cat. No. 25253). Distrilmtion. — From Bering Sea eastward to Sitka and westward to Kamchatka, 6 to 96 fathoms. NECTOCRANGON OVIFER. A deep-water species, also closely related to N'. lar. Median crest of carapace higher, spines more ascending, anterior marginal spines above the eyes longer and more deeply separated, e3^es larger, abdomen shorter, median carina higher, carina? of sixth somite terminating in a small spine or tooth. Eggs larger than in N. lar or N. dentata. Dimensions. — Female with eggs, length 60 mm., length of carapace 17.4 mm. Type locality. — Off the Trinity Islands, Alaska, 159 fathoms, station 2853, U. S. Fish Commission steamer Alhatross (Cat. No. 25254). Distrihution. — Found in Bering Sea and along the Alaska Peninsula, 56 to 368 fathoms. NECTOCRANGON CALIFORNIENSIS. Allied to N. omfer. Eyes smaller, spine of antennal scale project- ing not so far beyond the blade, hands having the digital spine situated nearer the wrist, and the distal margin in consequence more longitu- dinal; above all, the first and second abdominal somites are noncarinate, and the carina of the third and fourth somites is rather feebly devel- oped. Dimensions. — Male, length of bod}^ 31 mm., of carapace 8.6 mm. Type locality. — Off Santa Catalina Island, California, 80 fathoms, station 3664, U. S. Fish Commission ^i^^MH^)^- Albatross (Cat. No. 25255). NECTOCRANGON LEVIOR. Allied to N. crassa Rathbun, but has the first four abdominal somites noncarinate, except for a tubercle on the first, and the carinpe of the fifth and sixth somites less clearly marked than in that species. The pleura of all the somites have shallow depressions. Dimensions. — Female, length 47.7 mm., length of carapace 13.1mm. No.127-2. j^j<:]y i,/:(',\ron r/nSTACEANS—RATJIBUN. 893 Tt/j>, I oral fit/. ^Xdni'wiihy Inlet, Vugvt Sound, 40 fathoni.s; stution 2805, U. S. Fi.sh Conimission .steamer Allxdross (Cut. No. 25256). Dldrlhatkm. — Occiii-.s sparingly from Aleutian Islands to Puget Sound, in lo to <)S fathoms. Family IIIPPOLYTIU.FI Genus SPIRONTOCARIS. o. Spcci'S havivf) one or more su/>raorhital spines. SPIRONTOCARIS ARCUATA. Ver\' closely allied to, and in part associated with, ^S". fijyina (Sow- erl)y). In the adult female, the ui)per line of carapace and rostrum in proHle forms a sinolc curve, without the sinus shown in ^. spma; posterior lobe of third abdominal .somite shorter and broader than in tiiat sp(H-ies, sixth sei^ment considei-ably shorter, less than one and a half times as long-jis wide: dactyli of thii-d to fifth pairs of feet shorter than in *?>. .sphm, that of last pair l)eint;- contained at least three times in propodus. Dimension^. — Female, leng-th 58.8 mm., length of carapace and rostrum 2o nun., of rostrum s mm. Type locality. — Washington Sound, Straits of Fuca, 48 fathoms; station 28H4, U. S. Fish Conunission .steamer yl//WyvAs.y (Cat. No. 25257). I)i,\trihi(fl<)}i. — From Bering Sea to Straits of Fuca, in 3 to 350 fathoms. SPIRONTOCARIS MURDOCHI. Ifippoh/lf s/iimis MuRDocri, Report Internat. Polar Kxpod. to Point Barrow, Alaska, 1SS.5, p. 140 (not Cancer spinus iSowerby). Allied to v. .syv'//*/ (Sowerby) and X. liJjJKnujii (Danielssen). De- scription of female: Rostrum three-fourths as long as remainder of carapace, not reaching tij) of antiMuial .scale: midrib nearly horizontal; upper limb convex, 20 to 'l"! small irregular teeth; lower limb deeper, convex, 1 tt) 4 small teeth near end. Fyes as wide as the anteimular peduncle and half its scale. Spine of antemial scale advanced about as far as l)lade. Dactyli of last three pairs of feet long and slender, that of last pair half* as long as propodus. Abdomen not carinate; sixth segment three-fourths as broad as long. Dimensions. — Female, length 46.6 mm., length of carapace and rostrum IT nun., of rostrum 7.5 mm. Type locality. — Otl' Robben Island, east coast of Saghalin. Okhotsk Sea, station 3650, U. S. Fish Conmii.ssion steamer Albatross (Cat. No. 25258). Di.sf/'ihift io/).- AUo taken on the east coast of Kamchatka and Arctic coast of Alaska. 894 PROCEEDTNGS OF THE NATIONAL MUSEUM. vol.xxiv. SPIRONTOCARIS TRUNCATA. Allied to S. spina. Carapace armed with 4 median spines; rostrum subtriano'ular, widest at the extremity, about three-fifths as long as carapace, midrib curving upward, upper margin with 1 spine at its middle, extremity with 7 spines, 2 above and 4 below the midrib. Supraor])ital spines 2, equal, large, 1 behind, not above the other, distant. Diviensiojis.—LiQingth of male 14 mm. Ty2)e locality. — Heceta Bank, Oregon, 50 fathoms, station 2886, U. S. Fish Commission steamer Albatross (Cat. No. 25259). SPIRONTOCARIS SNYDERI. Near S. Mspinosa Holmes. Median spines of carapace 3 or 4, sep- arated from the rostral teeth, which are 5 or 6 on the upper margin and 3 or 4 on the lower. Rostrum shorter than carapace, much the shape of that of S. ly'ispinosa., excepting that the midrib is more rapidly ascending and ends in a short point, the u])per lamina is shallower and of rather even depth. Antennal peduncle reaches only about one- third length of scale. Dactyli of third, fourth, and fifth pairs of feet a third or less than a third as long as their propodi. DhneTisioiis. — Ovigerous female, approximate length, 28 mm.; length of carapace and rostrum, 9.4 mm.; of rostrum, 4.4 mm. Tyi^e locality. — Montere}^ Bay, California, J. O. Snyder, collector (Cat. No. 25260). Distribution. — From Puget Sound to Lower California. SPIRONTOCARIS SICA. Near S. bispinosa Holmes. The posterior tooth of the carapace is considerably in front of the middle. Rostrum shorter than in S. bispinosa., both upper and lower lamintu narrower and extending nearer the tip. Second segment of antennular peduncle three times as long as third segment. Outer maxillipeds reach beyond antennal scale. Thoracic feet longer and slenderer than in S. bispinosa., the first pair overreaching the antennular peduncle. The maxilliped and the first foot onl}^ are provided with an epipod. Dimensions. — Female, length 58 mm., length of carapace and ros- trum 24.8 mm., of rostrum 12.8 mm. Type locality. — Santa Barbara Channel, 265 fathoms, station 3200, U. S. Fish Commission steamer Albatross (Cat. No. 25261). Distribution. — Found only on the coast of California, 211 to 464 fathoms. SPIRONTOCARIS DALLI. Allied to 8. ochotensis (Brandt). Rostrum longer, reaching nearly to end of antennal scale, midrib straighter, less sinuous, terminating NO. 1272. NE W D ECA POD CR USTA CEANS—RA TUB UN. 89 5 in a single sharp spine; teeth 6 to 8 above, 3 to 4 below. Last three pairs of tliorac'ic feet lonoer and more slender than in S. ochotensis; sixth abdominal segment longer, being more than one and a half times as long as the fifth segment. Dimensions. — Female, approximate length 38 mm., length of cara- pace and rostrum 13.0 mm., of rostrum mm. Type loadity. — Coal Harbor, Unga Island, Alaska, 8 to 9 fathoms, W. IT. Dall, Collector (Cat. No. 252()2). Distrihution. — Alaska, (i to 20 fathoms. SPIRONTOCARIS UNALASKENSIS. Agrees with S. 2Jolc(''>'is (Sabine) and differs from all other species which possess a supraorl)ital spine, in the maxilliped l)eing without an exognath, while it and the first two pairs of feet are provided with an epipod. Female: Posterior median spine of carapace situated at the anterior third (rostrum excluded). Rostrum longer than acicle, dorsal spines -i or 5, 2 on carapace and 2 or 3 at base of rostrum; no upper limb on distal portion, lower limb shallow, convex. 3-spined in front of middle. Eyes large, pyriform. Third segment of antennules less than half as long as second. Antennal peduncle extending nearly to end of second segment of antennular peduncle. Hinder portion of third al)donnnal segment very prominent; sixth segment about one and two-thirds times as long as fifth. Dimensions. — Female, length (50 lum., carapace and rostrum 26.5 mm., rostrum 14.5 nmi. Type \>cality.—^orth of Unalaska, 350 fathoms, station 3331, U. S. Fish Commission steamer Albatross (Cat. No. 25203). SPIRONTOCARIS VICINA. Allied to the preceding; second foot without an epipod. Female. — Dorsal spines 7 or 8 (2 on carapace), the anterior not very near tip of rostrum; inferior spines 4. Second segment of antennular peduncle about three times as long as third; basal scale falls consider- ably short of second joint of peduncle, Antennal peduncle does not reach middle of second segment of antennular peduncle. Dimensions. — A female with rostrum and telson incomplete meas- ures 30 mm. from the orbit to the end of the sixth abdominal somite. Tyjh' localify. — North of rnalaska, 30!) fathoms, station 3310, U. S. Fish Commission steamer Alhatross (Cat. No. 25264). SPIRONTOCARIS WASHINGTONIANA. Female. — Posterior median spine at anterior fourth of carapace (rostrum excluded), liostrum slender, half as long as carapace, nearly horizontal, slightly siiuious, dorsal spines 4 (2 on carapace), 3 teeth below on anterior tliiid. Second .segment of antennular ])(Mluncle 896 PROCEEDINGS OF THE NATIONAL MUSEUM. v<.i..xxiy. three times as long as third; basal scale two-thirds as lono- us Hrst segment. Acicle two-thirds as long as carapace, olilong-lanceolate; peduncle reaching middle of acicle. Outer maxilliped extends beyond antennal scale by half the length of its last segment; without exopod, but with an epipod; first three pairs of feet with epipods. Dhnensions. — Female, length 39 mm., of carapace and rosti'um 14 uun., of rostrum 5 mm. Typelocality. — Off Sea Lion Rock, Washington, 685 fathoms, station 3071, U. S. Fish Commission steamer Alhatross (Cat. No. 25265). b. Species having tin supraorbital spine. SPIRONTOCARIS FLEXA. Very near /S. gracilis (Stimpson); differs chiefly in longer basal scale of antennula, reaching a little beyond tirst segment, in lower position of pterygostomian spine, in the presence of epipods on the maxilliped and first two pairs of feet. Dimensions. — Female, length 5-4 mm., of carapace and rostrum 20 mm., of rostrum 11.5 mm. Type locality. — North of Bird Island, Shumagins, Alaska, 21 fathoms, station 2850, U. S. Fish Commission steamer Alhatross (Cat. No. 25266). Distrihution. — From Bering Sea to Drakes Bay, California, 10 to 93 fathoms. SPIRONTOCARIS DECORA. Rostrum longer than carapace, 4 to 5 superior teeth (1 to 2 on carapace), anterior tooth in front of middle of rostrum; rostrum less slender than in S. (/racilis or S. flexa., a little concave above, nearly horizontal; 6 to 8 teeth l)elow\ Maxilliped without exognath, but with an epipod; no epipods on feet. Posterior margin of third abdominal segment strongly produced at the middle, but the segment is not laterally pinched or carinated; sixth segment longer than seventh. Dimensions. — Female, approximate length 47 nnu., length of cara- pace and rostrum 16.4 mm., of rostrum 9 nun. Type locality. — Off Santa Cruz Island, California, 150 fathoms, station 2946, U. S. Fish Connnission ate^m^v Alhatross (Cat. No. 25267). Distrihution. — From Straits of Fuca to San Diego, California, 50 to 171 fathoms. SPIRONTOCARIS TRIDENS. Allied to 8. gracilis., S. flexa, and S. decora, but stouter. Superior teeth 3, 1 on carapace and 2 at base of rostrum; inferior 3 to 6. Basal scale of antennules with a spine which extends nearly to end of second segment. Acicle, measured along its outer margin, a little shorter than carapace. Third abdominal somite well produced backward and NO. 1272. NEW DECAPOD CRUSTACEANS— RATHE UN. 897 it.s posterior portion ciirinated, the carina delined on either .side b}^ a deep groove like the imprint of a nail. Dimensions. — Female, approximate length 61 nmi.: length of cara- pace and ro.strmn 22 nun., of i-o.strum 12.5 mm. Ty2)e /wYe local It ;/.—Oi\ Santa Cruz. California, 21 fathoms, station 3124, U. 8. Fish Commission steamer Albatross (Cat. No. 25273). Dhtrihution. — Also taken on coast of Washington in 37 to 40 fathoms. SPIRONTOCARIS BIUNGUIS. Also of the gaimardii typo, ])ut easil}^ distinguished b}^ the very large, pyriform ej^es, the cornea covering the greater part of the peduncle, b}' the longer rostrum, which is from one and a fourth to ono and two-thirds times as long as the remainder of the carapace, by the maxilliped possessing an exopod and an epipod. while the feet aro destitute of epipods, and by the dactyli of the last three pairs of feet armed with a long subterminal spinule, which, folding again.st the slender tij) of the dactylus, gives the appearance of a minute chela. Dimensions. — Length of egg-laden female 83 mm., length of cara- pace and rostrum 37.6 mm., length of ro.strum 23.2 mm, Tyjje locality. — Ofl' Cape St. James, Queen Charlotte Islands, British Columbia, 876 fathoms, station 2860, U. S. Fish Commission steamer Allxitross (Cat. No. 25274). Distribution. — From Bering Sea to Oregon, 10!) to 987 fathoms. SPIRONTOCARIS STONEYI. A small species near S. cristata (Stimpson). Rostrum alwut half as long as carapace, upper margin convex, armed with 7 to 9 teeth (1 to 2 on carapace), unarmed and straight near tip; tip pointed; one tooth near tip below. A strong antennal, a slender ptorygostomian >pMio. Antennular peduncle reaching to middle of antennal scale; second segment one and a half times as long as third; outer scale not roaihing end of first segment. Antennal scale as long as carapace, spine reaching as far as blade: peduncle reaching* to a little be3'ond first segment of antennular peduncle. Fourth abdominal somite 9U0 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. unarmed; sixth somite more than one and a half times as long as fifth and equal to the telson, which has three pairs of lateral spines. Dimermons. — Female, length 20 mm., length of carapace and ros- trum 5.5 mm., of rostrum 1.8 mm. TyjM locality. — Bering Sea, latitude 62^^15' north, longitude 167^48' west, 20i fathoms, Lieut. George M. Stone}^ U. S. N., collector, June, 1884 (Cat. No. 25275). SPIRONTOCARIS MACROPHTHALMA. Allied to S. macilenta (Kr0yer) and S. hispinosa Holmes. Rostrum about three-fourths or five-sixths as long as carapace, upper and lower limbs with convex margins and widest at about the middle of their length; 10 to 14 teeth above (2 or 3 on carapace), 1 to 3 spines below; tip acute. No supraorbital nor pter3^gostomian spine. Eyes large, P3^riform, corneee extending almost to base of eyestalk on inner side, eye reaching two-thirds length of first antennular segment; this segment twice as long as second, and second three times as long as third. The blade of the antennal scale exceeds the spine considerably, and is most advanced toward its inner margin. Outer maxillipeds slender, reach- ing midway between end of antennal peduncle and end of scale. Last three pairs of feet long, fragile, unarmed. Difiers from S. macilenta in the much larger eyes, longer rostrum, of which the upper limb is narrowed at its base; from S. hispinosa in the absence of a supraorbital spine and of the long slender process of the rostrum. Dimensions. — Female, length 62.6 mm., length of carapace and ros- trum 24 mm., of rostrum 11 mm. Type locality. — Off' Tawhit Head, Washington, 178 fathoms, station 3076, U. S. Fish Commission steamer Albatross (Cat. No. 25276). Distribution. — Ranges from Unalaska to California, 178 to 636 fathoms. Family PANDALID^E. PANDALUS JORDANI. Near P. horealis Kr0yer. Rostrum similar to that of P. horealis., 14 to 17 spines above (4 on carapace), 7 to 10 below. Blade and spine of acicle equally advanced. Carpus of right cheliped of second pair divided into 19 to 22 segments; of left cheliped, into 58 to 63 seg- ments. Dact3'li of last three pairs of feet contained from 2^ to 2| times in their propodi. Third abdominal somite carinated in its pos- terior half, and with a slight lobe at the posterior third, which may almost disappear in large specimens. Dimensions. — Ovigerous female, length 124.5 mm,, length of cara- pace and rostrum 59.5 mm., of rostrum 38 mm. NO. i-'72. ^rj^]]' DECAPOD CR USTA CEANS—RA THE UN. 90 1 Typt'locallty. — Off Santa Cruz Island, California, 155 fathoms, sta- tion 2U4H (Cat. No. 2527T). Di.str'lhution. — From Unalaska to southern California, 35 to 178 fathoms. PANDALUS MONTAGUI TRIDENS. Differs from J\ moniiujid Leach of the Nortli Atlantic in its some- what lono-er rostrum, which varies from \^ to If times leno^th of cara- l)acc. the dorsal spines terminate l)ehind the middle of the rostrum and the tip is usually tritid, while in typical 1\ montagui the rostrum is from 1| to l.V times the carapace, its dorsal spines reach to or in front of the middle, and the tip is bilid. Dimensions. — Female, leng-th lO-l mm., length of carapace and i-os- trum 48.5 mm., of rostrum 'M).'2. mm. Type locidlty. — Oil' North Head. Akutan Island. Alaska, 72 fathoms, station 2842, U. S. Fish Commission ^toixxwGv Alhatr of carapace, anterior spine (exclusive of a subterminal spine) behind middle of rostrum; inferior spines 8 to 12. Peduncle of anteiuuda extends a little past middle of antennal scale; second segment 1+ times as long as third. IVduncle of antenna reaching to end of second .segment of antennula; .scale three-fourths to four-tifths as long as carapace, broader Ix'hind than in P. ampla. The outer 902 PROCEEDINGS .OF THE NATIONAL MUSEUM. vouxxiv. maxillipeds extend either to the tip or nearly to the tip of antennal scale. Feet of second pair subequal, carpal segments 18 to 21. Third, fourth, and fifth pairs of feet subequal, dact3'li subequal. Dimensions.- — Adult female, length 132 mm., length of carapace and rostrum 61.5 mm., of rostrum 33 mm. Tyjje locality. — Off Segouam, Aleutians, 283 fathoms, station 3480, U. S. Fish Commission steamer AlhatrofiK (Cat. No. 25280). PANDALOPSIS LONGIROSTRIS. Near /*. aleutica. Rostrum more than twice the length of remainder of carapace, strongly upturned. Antennal scale as long as carapace. Chelae of second pereiopods with fingers almost as long as palm. Dimensions. — Male, length 112 mm., length of carapace and rostrum 59 mm., of rostrum -41 mm. Tyj^e locality. — Oft' Iliuliuk Harbor, Unalaska, 309 fathoms, station 3316, U. S. Fish Commission steamer Albatross (Cat. No. 25690). PANDALOPSIS DISPAR. Rostrum from 2 to 2i times as long as the rest of the carapace; superior spines 16 to 21, 3 or 4 on carapace, posterior spine at anterior third of carapace, spines extending along whole length of rostrum; inferior spines 9 to 15, tip bifid. Carpal segments of second pair of feet, 26 to 33. Third, fourth, and fifth pairs of feet nearl}^ equal, their propodi increasing in length in the order named, while the dact3di increase in reverse order. Outer branch of swimming fan about as long as telson; inner branch much shorter. Dimensions. — Length of female 181 mm., length of carapace and rostrum 100.5 mm., of rostrum 73.5 mm. Ty2:)e locality. — Chernoffski Harbor, Unalaska, 109 fathoms, station 3324, U. S. Fish Commission steamer Albatross (Cat. No. 25281). Dlstrihution. — From Bering Sea to Washington, 53 to 351 fathoms. Family PONTONHD^F. PONTONIA CALIFORNIENSIS. Rostrum more than one-third the length of remainder of carapace, very narrow, deflexed, reaching middle of second antennular segment; this is one and a half times as long as third, both together half as long as first. Antennal scale scarcely exceeding antennular peduncle; antennal peduncle reaching end of scale. Of the first pair of feet the merus and carpus are subequal, the propodus a little shorter than the carpus, palm and fingers subequal. Right foot of second pair miss- ing, merus of left foot short and stout, carpus cup-shaped, palm and fingers subequal in length, palm two-thirds as broad as long, fingers N0.1272. NEW DECAPOD CRUSTACEANS— RATIIB UN. 903 gaping, prehensile edges denticulate, fringed with long huir. Dactyli of last three pairs of feet provided with a sul)terniinal and a terminal spine. Telson twice as long as sixth somite, two pairs of long lateral appressed spines inserted on anterior half. Dimensions. — Length of carapace and rostrum 0.7 mm., of rostrum l.S mm., of abdomen !> mm. Type local It ij. — Oil' Santa Cruz Island, California, 30 fathoms, station 2945, U. S. Fish Connnission steamer Allatro.s.^ (Cat. No. 2.5282). Family PAL.EMONlDaE. PALiEMONETES KADIAKENSIS. Rostrum about as long as carapace, 6 or 7 teeth above (1 })ehind orbit). 2 or o below. Antennular peduncle reaching about four-tifths the length of antennal scale. Scale as long, or nearh' as long, as carapace, ol)long, blade projecting considerably be^'ond scale. Outer maxillipeds very slender, reaching when extended onl}- a small bit beyond antennal peduncle. Feet of first pair near!}- to end of scale, carpus longer than merus, and more than twice as long as propodus, fingers and ])alm sube(|ual. Feet of second pair reaching beyond scale b}' half length of propodus, carpus li times merus, propodus three- fourths of carpus and no wider than in the first pair, fingers shorter than palm. Sixth abdominal somite twice as long as fifth and as long as telson. Dl/nenslons. — Length of female, 39 mm., of carapace and rostrum 15 mm., of rostrum 7 mm. Ti/j)e locality. — Kadiak Island, Alaska, under stones at low water; William J. Fisher, collector (Cat. No. 6246). UROCARIS INFRASPINIS. General appearance of U. lo7if/lcaudata Stimpson. Differs in having an antennal spine on the carapace, a distinctocellus outside the cornea, in having the palm and fingers of the first pair of feet subequal, the carpus of the second pair subetpial to the merus, the palm a little shorter and the fingers still shorter, and in having the sixth abdominal somite shorferthan the carapace (rostrum excluded) and less than twice as long as fifth somite. Dliiunsloiis. — Female with oggf^.., length of carapace and rostrum 6 nun., of rostrum 2.5 mm., of al)domen 15 mm. Type locality.— Gu\i of California in Concepcion Bay, Lower Cali- fornia, r. S. Fish Commission steamer Albatross (Cat. No. 25283). Distribution. — San Diego Bay, California, and Gulf of California. 904 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. Family OPLOPHORTD.E. HYMENODORA FRONTALIS. Surface covered with very tine wrinkles or rugose lines. Rostrum from two-fifths to one-half as long as remainder of carapace, reaching end of antennular peduncle; it is a slender sharp-pointed spine, distal half slightly curved upward, basal half armed above with from 3 to 6 small spines (2 or 3 on carapace). Antennular spine minute; antennal spine strong; from it a sharp carina runs back subparallel to the side margin and quite to the posterior margin. A blunt ridge on the branchial region. A deep groove extends obliquely downward and backward from the orbital sinus nearly to the lateral carina. Ej^es without pigment, with a slender blunt spine on inner margin. Anten- nal scale lanceolate; peduncle reaching end of first antennular seg- ment. Abdomen devoid of a median carina or median spines; sixth somite 2i times as long as fifth and l^etween three-fourths and four- fifths as long as telson. The unusually long rostrum distinguishes this from other species of Ihjmenodova. Dimensions. — Male, length of carapace and rostrum 19 mm., of rostrum 6.5 mm., of abdomen 32.5 mm. Type locality. — West of Unalaska, 322 fathoms, station 3327, U. S. Fish Commission steamer Alhatr<>!<>< (Cat. No. 25284). iJistrihution. — From Bering Sea and Kamchatka to ott' Monterey Bay, California, 322 to 1,771 fathoms. Family PASIPH.FID.E. PARAPASIPH^ SERRATA. Allied to P. gilesii Wood-Mason. Carapace and rostrum as long as first five abdominal somites. The median carina extends backward to the posterior fifth of the carapace and forward along the high thin rostrum, which extends to middle of eyestalks; carina a little concave at middle of carapace, anteriorly sloping downward and armed with 16 small teeth or spines, two of which are on the rostrum and one is terminal; below this spine the rostrum is a compressed finely crenulate lobe. Antennular scale as long as })asal joint of peduncle. Antennal scale nearl}" half as long as carapace proper. Fingers of first pair of feet equal to palm in length; third pair (tip broken off) equal to cara- pace exclusive of rostrum; fourth and fifth pairs have the terminal joint narrow-oval, fifth pair the longer and two-thirds the length of carapace. First three abdominal somites noncarmate, fourth termi- nating in a thin compressed spine. Dimensions. — Egg-laden female, length of carapace and rostrum 23.6 nun., rostrum 1.8 mm., abdomen 42 mm. NO. 1272. NE w DEC A POD CR USTA CEANS—RA THE UN. 905 T(/j)e locality. — Off Cortez Bank, California, 984 fathoms, station 2911), U. S. Fish Commission steamer Alhatrrm (Cat. No. 25285). PASIPH^A PACIFICA. Carapace distinct!}" carinated, carina anterior!}' sharp and termi- iiatino- in a rather slender sharp-pointed tooth or spine, which falls far short of the anterior margin. The branchiosteoal sinus is an obtuse ano-le; the branchiosteo-al spine is situated over the antrle of the sinus. Eyes dark l)rown. The merus of the first pair of feet is either unarmed or may have one to three spines. First abdominal somite noncarinate; second to sixth, inclusive, carinate; telson four- lifths as long- as sixth somite; its extremit}^ has a deep notch. Dinwiisfons. — Female, length 64.8 mm., carapace 20.3 mm. Ti/j>t' locality. — Oft' Point Sur, California, 328 fathoms, station 3186, U. 8. Fish Commission steamer Albatross (Cat. No. 25286). Dixtrihution. — From Unalaska to Gulf of California in 53 to 390 fathoms. PASIPHiEA EMARGINATA. Near P.faxoni (new name = P. acutifrons Faxon, not Bate). Differs in longer carapace, which is equal to the first live segments and one- half of the sixth segment of the abdomen; more sinuous branchial ridge; less prominent median carina; smaller gastric tooth; longer telson, which has a verj- shallow notch, scarcely forked. Dimensions. — Length of female SI mm., length of carapace 33.3 mm. Tyj^e locnlity. — Gulf of California. 857 fathoms, station 3009, U. S. Fish Commission steamer Albatross (Cat. No. 25552). PASIPH/EA CORTEZIANA. Carapace verj' bluntlv carinated ])ehincl gastric tooth, which is denti- form and does not overreach margin of front; branchiostegal spine near antero-lateral angle, just behind anterior margin; antero-lateral sinus forming an obtuse angle; eye-stalks slightly enlarged distall}'^, eyes reddish brown; abdomen not carinated; telson with a deep notch. IJiiinnsions of male. — Length »i4 nnn., length of carapace 23.8 mm. Tj/jh' locality. — Near Cortez Bank, California, 776 fathoms, station 3627, U. S. Fish Commission steamer Albatross (Cat. No. 25553). PASIPHiEA AFFINIS. Diflers from P. corteziana in its shorter carapace (equal to the first four and iialf the fifth segment of the abdomen), without median carina, and in the abdomen being carinated. Jjiinensions. — Length of male 67 mm., length of carapace 22 mm. Type locality. — Near Cortez Bank, California, 984 iathoms, station 2!>19. U. 8. Fish Commission steamer Albatross (Cat. No. 25691).