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Show 392 ON FRESH-WATER FISHES OF TRINIDAD. [Apr. 10, from yellowish to blackish blue, sometimes edged with black white. " Found singly or in pairs in most streams and pools and take a hook readily at times." Hab. Rio Grande do Sul to Venezuela. 35. ACARA PULCHRA Gill. (Plate XXV. fig. 1.) " Small Cascarob." " This is a very elegant fish, prettily marked with bright green and blue spots and with dark cross-bars on the sides. It was interesting to see one of these beautiful fish in charge of its family of about one hundred young ones, which he or she was vigorously defending. These small fry were moving under its body, and when any other fish made an attempt to snatch one, he or she snapped viciously at the offender. This species is plentiful everywhere." Hab. Colombia ; Venezuela ; Trinidad. 36. ClCHLOSOMA BIMACULATUM L. " Large Cascarob." " Plentiful in muddy rivers, ponds and swamps, but not in the clear streams." Hab. Brazil; Guiana; Venezuela. 37. PHILYPNUS DORMITATOR Lacep. " Taken in the Caroni River; the specimen was very docile, allowing us to handle it and making no display of resistance." Hab. West Indies and Atlantic Coast streams from Mexico to Guiana. 38. DORMITATOR MACULATUS Bl. " Taken at Bejucal Swamp in muddy pools." Hab. Atlantic coasts and rivers of Tropical America. 39. GOBIUS FASCIATUS Gill. Body compressed, elongate, the depth 6 in the length, the length of head 3^-3|. Snout as long as eye, the diameter of which is 4 in the length of head. Interorbital space narrow. Cleft of mouth slightly oblique, entirely below the level of the eye; maxillary extending to below anterior part of eye; jaws with bands of small pointed teeth and anteriorly with an outer series of larger teeth ; posterior tooth of outer series in lower jaw a curved canine. Gill-openings vertical, in front of the bases of the pectorals, not produced forwards below. Head and nape, thorax and lower part of abdomen naked; scales finely ctenoid, increasing in size posteriorly, about 32 in a longitudinal series. Dorsal VI, 12 ; rays of anterior dorsal, especially the third, produced as filaments in the male. Anal 13. Pectoral without free rays above, as long as head, extending to the origin of anal. Ventrals extending nearly to the origin of anal. Caudal rounded, rather elongate, \ the length of the fish. Greenish, with dark |