PROC. BIOL. SOC. WASH. 101(3), 1988, pp. 603-613 BOORALANA TRICARINATA, A NEW SPECIES OF ISOPOD FROM THE WESTERN ATLANTIC OCEAN (CRUSTACEA: ISOPODA: CIROLANIDAE) David K. Camp and Richard W. Heard Abstract. —Booralana tricarinata is described from deep-shelf and upper-slope waters off the Bahamas and the Antilles. It is the third species to be assigned to the recently erected cirolanid genus Booralana Bruce, 1986, and the first record of the genus beyond Australian waters. The large species, reach-ing 54 mm in length, can be distinguished from the other two species by the presence of a median and a pair of submedian carinae on the dorsal surface of the pleotelson. Bruce (1985:714) discussed 15 genera in a synopsis of the Cirolanidae of the Carib-bean Sea and Gulf of Mexico and presented a key to the 1 2 nontroglobitic genera known from that area. Kensley (1987) added a new genus, Xylolana, to the Caribbean cirolanid genera. The new species described below represents another cirolanid genus now known to occur in that region: Booralana Bruce, 1986. The genus previously com-prised only two other species, B. bathynella (Bruce, 1981) and 5. wundurra Bruce, 1986, from the Indo-West Pacific Region at Aus-tralia (Bruce 1986). All measurements are in millimeters (mm). Specimens are deposited in the Na-tional Museum of Natural History (USNM), Smithsonian Institution, Washington, D.C.; the Florida Department of Natural Re-sources Marine Invertebrate Collection (FSBC I), St. Petersburg; the Gulf Coast Re-search Laboratory Invertebrate Collection (GCRL-I), Ocean Springs, Mississippi; and personal collections. Cirolanidae Genus Booralana Bruce, 1986 Booralana tricarinata, new species Figs. 1-5 Holotype. — \ male, 53 mm; Atlantic Ocean, Northwest Providence Channel, about 3 km southeast of Lucaya, Grand Ba-hama Island, 200-250 m, baited mollusk trap; coll. J. Worsfold, Mar 1984; USNM 229974. Paratypes. — 1 non-incubatory female, 47 mm; Atlantic Ocean, Straits of Florida, west of Little Bahama Bank, 27°04.0'N, 79°18.8'W, ALVIN dive 77-761, no. F-1, 610 m, from fish trap; May-Jun 1977; USNM 229969.-1 male, 51 mm, 66 ju-veniles, 10-26 mm, 8 fragments; Atlantic Ocean, Northwest Providence Channel, off Lucaya, Grand Bahama Island, 1 80-220 m, from baited mollusk trap; coll. W. Lyons, J. Worsfold, and R. Quigley, 24 May 1981; FSBC I 32700.-6 males, 34-47 mm, 1 in-cubatory female, 49 mm, 1 non-incubatory female, 35 mm, 8 subadults 21-29 mm; same data as for holotype; USNM 229975 (2 males, 1 female), FSBC I 32701 (4 males, 1 female, 8 subadults).— 4 males, 37^7 mm, 2 incubatory females, 47 and 48 mm, 8 non-incubatory and subadult females, 30-54 mm; Atlantic Ocean, off north coast of Puerto Rico, 18°30'N, 65°42'W, 435 m, R/V Oregon II Station 31794, from baited fish trap; coll. S. Candileri, 10 Jul 1980; FSBC I 32347 (2 females), GCRL-I-87-1 129 (3 males, 5 females), collection of N. Bruce (1 female), collection of R. Heard (1 male, 2 females). — 1 male, fragment; Caribbean Sea,
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