PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 235 LIST or FISHES OBSERVED IN THE SAINT JOHN'S RIVER AT JACKSONVILLE, FLORIDA. By DAVID 8. JORDAIV anfl SETH E. ITIEEK. Oue day in the month of November, 1883, was spent by Professor Jordan at Jacksonville, Fla., in a study of the fishes of the markets. The following is a list of the species seen. The Cyprinodontida' were taken from a small brook south of the town, a few of the others were caught with a hook from the wharves, while the others were seen in the markets, whiiher they had been brought from the mouth of the river. Only the Ictalurns and the Cyprinodontidce were preserved. These are in the National Museum. 1. Ictalurus niveiventris (Cope) Jordan & Gilbert. One specimen 12^ inches in length taken with a hook on the wharf. Head 3§ in length ; width of head 4^ in length ; eye 4 in interorbital area ; origin of dorsal scarcely nearer end of snout than adipose fin ; length of dorsal spine 3 in distance from tip of snout to root of spine; upper jaw projecting slightly beyond lower; maxillary barbels scarcely reaching gill openings ; pectoral spine large, retrorse-serrate on its inner edge; humeral process more than half the length of pectoral spine, very rugose ; anal shorter than head, its longest ray 2 in base of fin ; caudal weakly forked, its inner rays about If in outer ones, lower lobe broader than upper ; adipose fin large. This fish differs but slightly from Cope's description (Proc. Amer. Phil. Soc, 1870, 486). Hitherto only the original type had been known, from the Neuse Eiver^ in North Carolina. 2. Gambusia patruelis (Bairtl & Girard) Girard. Numerous specimens, the largest 2^^ inches in length, taken from a small bank near Jacksonville. At this season (November) the young are undeveloped in the ovaries. The characters noticed by Jordan & Gilbert (Proc. U. S. Nat. Mus., V, 1882, 257) as separating Gambusia patruelis, from Gambusia JiolbrooM, do not seem constant in these spec-imens. The head varies from about 3f to 3§ in length of body, and the eye from 1^ to If in length of head. Sufiicient variation will no doubt be found to exist in specimens taken from different streams to render it necessary to regard G. holbrooJci as fully identical with G. patruelis. The dark cross-streaks on the caudal are sharply defined, especially in the larger specimens, which are the largest of this si)ecies yet seen by us. 3. Mollienesia latipinna Le Sueur. Seven specimens, females 5, males 2 ; the largest a female 2.1 inches in length ; dorsal raj's 13 ; its insertion behind a vertical from root of veutrals, more notably so in female specimens ; eye about 2^ in head,
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