The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Trematocara marginatum. See p. 192. III. 7-8 ; third spine longest, a little shorter than last dorsal spine. Caudal feeblyemarginate. Caudal peduncle \h times as long as deep. Scales with finely den- 25—29 ticulate border, 37-40, lat. 1, Pale brownish above, silvery 9—10- 13—17 beneath ; a blackish opercular spot ; dorsal and anal edged with black ; 4 or 5 blackliars across the caudal; young with black bars across the dorsal. Total length, 110 millim. Described from se
The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Trematocara marginatum. See p. 192. III. 7-8 ; third spine longest, a little shorter than last dorsal spine. Caudal feeblyemarginate. Caudal peduncle \h times as long as deep. Scales with finely den- 25—29 ticulate border, 37-40, lat. 1, Pale brownish above, silvery 9—10- 13—17 beneath ; a blackish opercular spot ; dorsal and anal edged with black ; 4 or 5 blackliars across the caudal; young with black bars across the dorsal. Total length, 110 millim. Described from several specimens from Ectodus descampsi. See p. 186. 43. Paratilapia macrops.—Blgr. 1898. (Fig., p. 185.) Teeth small, in 3 series in each jaw, forming a narrow band, outer of body three times in total length ; length of head, 2| to 3. Snout withstraight upper profile, a little shorter than the eye, the diameter of which is i\times in length of head and exceeds interorbital width ; maxillary extending tobelow anterior border of eye ; 2 or 3 series of scales on the cheek ; large scales onthe opercle. Gill-rakers short, 11 on lower part of anterior arch. Dorsal XVI. I 2* i8o THE TANGANYIKA PROBLEM. 10-12 ; spines increasing in length to the sixth, which measures a little less than\ length of head and equals longest soft rays. Pectoral as long as head. Ventral extend-ing a little beyond origin of anal. Anal III. 6-7 ; third spine longest, a little shorterthan longest dorsal. Caudal with crescentic emargination. Caudal peduncle as long as deep. Scales very finely denticulate on the edge, 33-34
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