The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Paratilapia ventralis. See p. 180. 204 THE TANGANYIKA PROBLEM. 74. Tilapia trematocephala.—Blgr. 1901. (Fig. p. 195. Upper.) Depth of body equal to length of head, 3^ times in total length. Snout, withslightly convex upper profile, a little shorter than diameter of eye, which is contained3 times in length of head and exceeds interocular width ; mouth small, its widthhalf that of head, extending to between nostril and eye ; teeth very small, in 2 rows,outer bicuspid ; 3
The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Paratilapia ventralis. See p. 180. 204 THE TANGANYIKA PROBLEM. 74. Tilapia trematocephala.—Blgr. 1901. (Fig. p. 195. Upper.) Depth of body equal to length of head, 3^ times in total length. Snout, withslightly convex upper profile, a little shorter than diameter of eye, which is contained3 times in length of head and exceeds interocular width ; mouth small, its widthhalf that of head, extending to between nostril and eye ; teeth very small, in 2 rows,outer bicuspid ; 3 series of scales on the cheek ; large scales on the opercle;orifices of sensory canals on head remarkably large. Gill-rakers rather short, 13 onlower part of anterior arch. Dorsal XVI. 11 ; last spine longest, half length ofhead ; longest soft rays produced into filaments, half length of head. Pectoralpointed, J length of head, not reaching origin of anal. Ventral produced intoa filament, extending beyond origin of anal. Anal III. 9 ; third spine as long as. Telmatochromis temporalis. See p. 194. and stronger than last dorsal spine ; some of the soft rays produced into filaments as in the dorsal. Caudal deeply emarginate. Caudal peduncle \h as long as deep. 3 28 Scales very thin, without denticulation, 40—; lat. 1. —-—. Brownish, dorsal 10 ? and caudal greyish ; ventrals and anal black, latter edged with white. Total length, 90 millim. Described from a single specimen from the north end of Lake Tanganyika. 75. Tilapia boops.—Blgr. 1901. (Fig. 3, p. 175.) Depth of body equal to length of head, 3J to 3$ times in total length. Snoutwith strongly convex upper profile, shorter than diameter of eye, which is 2h timesin length of head, and exceeds a little interocular width ; mouth f width of head,sub-inferior, not extending quite to below anterior border of eye ; teeth very small,
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