THE TANGANYIKA PROBLEM. 
179 
eye, the diameter of which is double the interocular width, and is contained 3 to 3 \ 
times in length of head ; lower jaw projecting beyond the upper ; maxillary extend- 
ing to below anterior fourth of eye ; teeth small in two rows ; 2 or 3 series of 
scales on the cheek ; large scales on the opercle. Gill-rakers moderately long, 15 
on lower part of anterior arch. Dorsal XVI. -XVII. 10 ; spines increasing in length 
to the last, which measures § or ^ length of head ; longest soft rays § or f length of 
head. Pectoral pointed, a little shorter than head. Ventral reaching vent. Anal 
Trematocara marginatum. See p. 192. 
III. 7-8 ; third spine longest, a little shorter than last dorsal spine. Caudal feebly 
emarginate. Caudal peduncle i^- times as long as deep. Scales with finely den- 
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 black 
bars across the caudal ; young with black bars across the dorsal. 
Total length, no millim. 
Described from several specimens from Kalambo. 
Ectodus descampsi. See p. 1S6. 
43. Paratilapia macrops. — Blgr. 1898. (Fig., p. 185.) 
Teeth small, in 3 series in each jaw, forming a narrow band, outer largest. 
Depth of body three times in total length ; length of head, 2§ to 3. Snout with 
straight upper profile, a little shorter than the eye, the diameter of which is 2 [ \ 
times in length of head and exceeds interorbital width ; maxillary extending to 
below anterior border of eye ; 2 or 3 series of scales on the cheek ; large scales on 
the opercle. Gill-rakers short, 11 on lower part of anterior arch. Dorsal XVI. 
I 2* 
