4 Mr. G. A. Boulenger on 
GEPHYROCHROMIS, gen. nov. 
A band of very small tricuspid teeth in both jaws and an 
outer series of larger conical teeth. Anal spines 3. 
Differs from Paratilapia as Telmatochromis trom Lampro- 
logus. 
Gephyrochromis Moorti. 
D. XVII8. A.III7. Sq. 303. L. lat. 22/13. 
Depth of body equal to length of head, 3 times in total 
length. Diameter of eye 3} times in length of head ; 3 series 
of scales on the cheek. 18 gill-rakers on lower part of ante- 
rior arch. Caudal rounded. 
Total length 120 millim. 
A single specimen from the north end of Lake Tanganyika. 
Tilapia pleurotenia. 
D, XV-XVIII 11-12. A. III 8-10. Sq. 32-35 5=;. 
L. lat. 22-24/10-15. 
Depth of body 24 to 3 times in total length, length of head 
3 to 84. Diameter of eye 3 to 34 times in length of head; 
mouth extending to below nostril or between nostril and eye ; 
3 series of teeth ; 3 or 4 series of scales on the cheek. 10-12 
gill-rakers on lower part of anterior arch. Pectoral a little 
shorter than head. Caudal deeply notched. A _ blackish 
lateral stripe. 
Total length 110 millim. 
Several specimens from the north end of Lake Tanganyika 
and from the Usisi River. 
Tilapia trematocephala. 
D.XVI1J. A.III9. Sq. 403. L. lat. 28/2. 
Depth of body equal to length of head, 3} times in total 
length. Sensory organs on the head with very wide openings ; 
diameter of eye 3 times in length of head; mouth extending 
to between nostril and eye; 2 series of teeth; 3 series of 
scales on the cheek. 13 gill-rakers on lower part of anterior 
arch. Pectoral # length of head. Caudal deeply notched. 
Ventral and anal black, latter edged with white. 
Total length 90 millim. 
A single specimen from the north end of Lake Tanganyika. 
