. The freshwater fishes of British Guiana, including a study of the ecological grouping of species and the relation of the fauna of the plateau to that of the lowlands . nd spotted with darker. Head to gill-opening 5 in the length; greatest width ; distance of dorsalfrom tip of snout ; caudal 4; D. 5; A. 6. 9. Bunocephalus amaurus sp. nov. (Plate I, fig. 2.)Bunocephalus amaurus Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 380 (name only). Type, 69 mm. Konawaruk. (Carnegie Museum Catalog of Fishes ) Cotype, 53 mm. Konawaruk. (I. U. Cat. No. 11973.) Head to gill-op
. The freshwater fishes of British Guiana, including a study of the ecological grouping of species and the relation of the fauna of the plateau to that of the lowlands . nd spotted with darker. Head to gill-opening 5 in the length; greatest width ; distance of dorsalfrom tip of snout ; caudal 4; D. 5; A. 6. 9. Bunocephalus amaurus sp. nov. (Plate I, fig. 2.)Bunocephalus amaurus Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 380 (name only). Type, 69 mm. Konawaruk. (Carnegie Museum Catalog of Fishes ) Cotype, 53 mm. Konawaruk. (I. U. Cat. No. 11973.) Head to gill-opening in the length; greatest width ; distance of dorsalfrom tip of snout in the length; caudal nearly 5. D. 5; A. 7; depth ofhead in distance from pectoral to tip of snout; length of coracoid process aboutequal to the distance between their bases; anterior margin of coracoid with anexternally perceptible crest. Head verrucose but without knobs; nuchal crestprominent, a notch between it and the knobbed dorsal plate. Maxillary barbels reaching pectoral; pectorals not quite to ventrals; humeral EIGENMANN: THE FRESHWATER FISHES OF BRITISH GUIANA 127. process reaching last fourth of the pectoral spine; half of the last dorsal ray adnate;caudal peduncle terete; everywhere tuberculate, nine conspicuous series of tubercleson the tail. Dark chocolate, a light saddle between the dorsal and nuchal crest; back be-hind the dorsal with lighter blotches; dorsal, caudal, and anal fins black, theirmargins white, first rays of dorsal and analand outer rays of caudal banded; ventralsmottled, margined with white, darkest justbelow the light edge; pectorals black, lastrays with light mottlings; barbels banded. 10. Bunocephalus chamaizelus sp. nov.(Plate II, fig. 1.)Bunocephalus chamaizelus Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 380 (name only). Type, 36 mm. Erukin. (Carnegie Mu-seum Catalog of Fishes No. 1556.) Cotypes, five specimens, 24-44 (C. M.
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