Catalogue of the fresh-water fishes of Africa in the British Museum (Natural History) . oon. 6-10. Ad. & bgr. Ja R. at Bitye, Ad. Talagouga, Ogowe. Ibali, Lake Leopold II, Upper Congo. M. P. Delbez (C). Upper Congo. Brussels University. Dr. Buttil<oEer (C). Ansorge(C).G. L. Bates, Esq. (C). Miss Kino-sley (C). 14. Hgr 15. Ad. 16. Ad. Banzyville, Ubanghi. 17-18. Hgr. &yg. Quanza R., Angola. Capt. Royaux (C).Dr. W. J. Ansorge (C). 6. PETROCEPHALUS bovei, Cuv. & Val. Poiss. xix. p. 283 (1846) ; Giinth. Pethericks Trav. ii. p. 255 (1869); Steind. Si
Catalogue of the fresh-water fishes of Africa in the British Museum (Natural History) . oon. 6-10. Ad. & bgr. Ja R. at Bitye, Ad. Talagouga, Ogowe. Ibali, Lake Leopold II, Upper Congo. M. P. Delbez (C). Upper Congo. Brussels University. Dr. Buttil<oEer (C). Ansorge(C).G. L. Bates, Esq. (C). Miss Kino-sley (C). 14. Hgr 15. Ad. 16. Ad. Banzyville, Ubanghi. 17-18. Hgr. &yg. Quanza R., Angola. Capt. Royaux (C).Dr. W. J. Ansorge (C). 6. PETROCEPHALUS bovei, Cuv. & Val. Poiss. xix. p. 283 (1846) ; Giinth. Pethericks Trav. ii. p. 255 (1869); Steind. Sitzb. Ak. Wien, lxi. i. 1870, p. bovei, Marcusen, Bull. Ac. St. Petersb. xii. 1854, p. 14 ; Bouleng. Proc. Zool. Soc. 1898, p. 789, and Fish. Nile, p. 36, pi. viii. fig. 1 (1907). Depth of body 3 to 3J times in total length, length of head 4 to 4Jtimes. Head as long as deep; snout very short, \ to j length ofhead, rounded, projecting beyond mouth ; mouth below eye, its width§- to -| length of head ; teeth bicuspid, 10-14 in upper jaw, 10-20 in Fig. plIP^ Petrocepliulus Nile (F. N.). lower; nostrils on a level with lower border of eye; eye large, longerthan snout, its diameter 3\ to i\ times in length of head, \\ to If timesin interorbital width. Dorsal 22-26, originating above 6th to 8th rayof anal, its length \\ to 2 times in its distance from head and a little PETROCEPIIALUS. 55 less than its distance from caudal. Anal 30-35, equally distant frombase of ventral and from base of caudal, or a little nearer pointed, f- to f length of head, nearly twice as long as ventral,and extending beyond base of latter. Caudal scaled at the base, withpointed lobes. Caudal peduncle 2£ to barely 3 times as long as deep,§ to j length of head. 38-43 scales in lateral line, u~lr in transverseseries on body, ^_vj in transverse series between dorsal and anal, 10 or12 round caudal peduncle. Uniform silvery, the back a little darker,the fins white
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