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Show 382 MR. C. TATE REGAN ON [Apr. 10, 1. MACRODON TRAHIRA Spix. " Guabin." " Much appreciated as an article of food, although rather bony ; they are purchased readily by the labouring classes. " A very small specimen"(30 mm.) was caught at Cumuto ; it was skimming along the top of the water when captured. Examples of this size can vibrate the pectoral fins with extreme rapidity; they often rest as if asleep, hence the name ' Dormeuse.' " Colour: greenish, a more or less distinct blackish longitudinal band and irregular cross-bars; vertical fins with series of dark spots." Hab. Brazil; Guiana; Venezuela. 2. ERYTHRINUS UNIT^NIATUS Spix. " Yarrow." 11 Found all over the island in muddy streams. " Colour : greenish or olivaceous; sometimes a dark longitudinal lateral stripe ; fins pink." Hab. Brazil; Guiana; Venezuela. Genus CORYNOPOMA. Slevardia Gill, Ann. Lye. N. York, vi. 1858, p. 424. Corynopoma Gill, t. c. p. 425; Giinth. Cat. Fish. v. p. 287 (1864). Nematopoma Gill, t. c. p. 428. This genus appears to be allied to Tetragonopterus, from which it differs in the more posterior position of the dorsal fin, the absence of an adipose fin, and in the curious sexual characters. 3. CORYNOPOMA RUSH. (Plate XXII. fig. 3.) Stevardia albipinnis Gill, Ann. Lye. N. York, vi. 1858, p. 425. Corynopoma riisei Gill, t. c. p. 426 ; Giinth. Cat. Fish. v. p. 287 (1864); Lutken, Vid. Med. 1874, p. 223. Corynopoma veedoni Gill, t. c. p. 427 ; Giinth. 1. c. Nematopoma searlesii Gill, t. c. p. 429. Corynopoma albipinnis Giinth. 1. c. Corynopoma searlesii Giinth. t. c. p. 288 ; Liitk. 1. c. fig. Body compressed, subfusiform, the depth 3-34 in the length, the length of head 4|-4|. Snout much shorter than eye, the diameter of which is 2^-2| in the length of head and nearly equal to the interorbital width. Mouth small, very oblique, the maxillary nearly vertical, just in front of the eye. Teeth compressed, with strong median cusp and 1 to 3 smaller cusps on each side, in 2 series in the upper jaw, 1 in the lower. Operculum, in the female, with a short pointed projection ; in the adult male with a long, slender, curved process terminating in a compressed expansion at the level fi-7 of the dorsal fin. Scales 38-44 ^§, 5 or 6 between lateral line and root of ventral; lateral line complete. Dorsal 9-11, commencing |