2o6 
THE TANGANYIKA PROBLEM. 
tricuspid, in 3 rows ; 2 or 3 series of scales on the cheek ; large scales on the 
opercle. Gill-rakers short, 13 on lower portion of anterior arch. Dorsal XII. -XIII. 
14 ; spines slender, equal from the seventh, which measures nearly J length of head ; 
soft rays scarcely longer. Pectoral pointed, as long as head, reaching origin 
of anal. Ventral produced into a filament, extending beyond origin of anal. Anal 
III. S-9 ; third spine as long as and stronger than longest dorsal spines. Caudal 
deeply emarginate, crescentic. Caudal peduncle nearly twice as long as deep. 
Scales thin, without denticulation, 39-40 ; lat- 1 ^ Brown above, 
white beneath ; a blackish opercular spot. 
Total length, 90 millim. 
Described from two specimens from Msambu. 
76. Tilapia grandoculis. — Blgr. 1899. (Fig. p. 193. Lower.) 
Teeth very small, in 4 or 5 series in both jaws, of outer series larger, hi- or 
tricuspid, and very obtuse. Depth of body 3} times in total length, length of head 3. 
Snout short, with rounded upper profile ; eye very large, a little longer than the 
snout, its diameter 2\ in length of head, and slightly greater than the interorbital 
width ; mouth small, i width of head, extending to between nostril and eye ; a few 
deciduous scales on the cheek ; larger scales on the opercle. Gill-rakers very short, 
rather thick, 17 on lower part of anterior arch. Dorsal XIII. 14 ; spines slender, 
equal in length from seventh, measuring l length of head, and a little shorter than 
longest soft rays. Pectoral falciform, slightly longer than the head, extending as 
far as origin of anal. Ventral prolonged in a long filament extending beyond 
origin of anal. Anal III. 10 ; third spine shorter but stronger than longest 
dorsals. Caudal with deep crescentic notch. Caudal peduncle a little longer than 
deep. Scales mostly ctenoid, 63 — ; lat. 1 Brown above, with ill-defined 
H 25 32—36 
darker spots, whitish beneath ; pectorals yellowish ; other fins blackish towards the 
edge. 
Total length, 1 1 5 millim. 
Described from a single specimen. 
77. Tilapia microlepis. — Blgr. 1899. (Fig. facing p. 204.) 
Teeth very small, in 4 series close together in both jaws, outer larger, biscupid, 
with a principal and a small lateral cusp. Depth of body 3jj to 4 times in total 
length, length of head 3. Snout, with straight or slightly convex upper profile, ii 
the diameter of the eye, which is nearly 4 times in length of head and equals inter- 
orbital width ; mouth moderate, its width | that of the head, extending to between 
nostril and eye ; 7 or 8 rows of scales on the cheek ; larger scales on the 
opercle. Gill-rakers short, rather thick, 13 or 14 on lower part of anterior arch. 
Dorsal XVI. -XVII. 14-15 ; spines sub-equal in length from the fifth or sixth, 
measuring i j length of head and a little shorter than longest soft rays. Pectoral 
acutely pointed, ® length of head, not extending to origin of anal. Ventral widely 
separated from vent. Anal III. 9 ; third spine as long as and a little stronger than 
