4 Mr. G. A. Buulcnger on 



Gephyrociiromis, gen. nov. 



A bantl of very small tricuspid teeth in both jaws and an 

 outer series of larger conical teeth. Anal spines 3. 



Differs from Paratilapia as Tehnatochromis from Lampro- 

 logus. 



G ephyrochromis Moorii. 

 D. XYII 8. A. Ill 7. Sq. 30 ~. 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. 13 gill-rakers on lower part of ante- 

 rior arch. Caudal rounded. 



Total length 120 niillim. 



A single specimen from the north end of Lake Tanganyika, 



Tilapia pleurokenia. 



D. XV-XVIII 11-12. A. Ill 8-10. Sq. 32-35 n^ri- 

 L. lat. 22-24/10-15. 



Depth of bod}' 2\ to 3 times in total length, length of head 

 3 to 3^, Diameter of eye 3 to 3^ 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. 10-1 2 

 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. 



Tilopia trematocephala. 

 D. XVI 11. A. Ill 9. Sq. 40^;. L. lat. 28/?. 



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 raillim. 



A single specimen from the north end of Lake Tanganyika. 



