.204 



CICHLID.E. 



92. TILAPIA TEEMATOCEPHALA. 

 Bouleng. Ann. & Mag. N. H. (7) vii. 1901, p. 4, Poiss. Biiss. Congo, p. 475 (1901), 



and Tr. Zool. See. xvi. 1901, p. 157, pi. xix. fig. 6 ; PellegT. Mem. Soc. Zool. 



France, xvi. 1904, p. 334. 

 Depth of body equal to length of head, oj times in total length. 

 Head a little over twice as long as broad ; snout rounded, with slightly 

 convex upper profile, as long as broad, as long as postocnlar part of 

 head; eye 3 times in length of head, exceeding interorbital width, nearly 

 twice as long as least prseorbital depth ; mouth small, | width of head, 

 extending to between nostril and eye ; teeth very small, in 2 series, 

 about 50 in outer series of upper jaw; 3 series of scales on the cheek; 



Fig. 179. 





fc, — , I ^ ^^ ^ — 



Tilapia trematocephala. 

 Type (Tr. Z. S. 1901). 



orifices of sensory canals on head remarkably large. Gill-rakers rather 

 short, 13 on lower part of anterior arch. Dorsal XVI 11 ; last spine 

 longest, \ length of head ; longest soft rays produced into filaments, as 

 long as head. Anal III 9 ; third spine nearly as long as and stronger 

 than last dorsal. Pectoral f length of head, not reaching vertical of 

 origin of anal. Ventral extending beyond origin of anal. Caudal 

 deeply emarginate. Caudal peduncle IJ times as long as deep. Scales 

 very indistinctly denticulate, 40 jq ; lateral lines y. Brownish; dorsal 

 and caudal greyish ; ventrals and anal black, latter edged with white. 



Total length 90 millim. 



Lake Tanganyika. 



1. Type. 



North end of L. Tanganyika. 



Prof. J. E. S. Moore (C). 



