2G4 



CICHLID.E. 



92. TILAPIA TREMATOCEPHALA. 



Bouleng. Ann. & Mixer. N. ^I. (7) vii. 1901, p. 4, Poiss. Bass. Congo, p. 475 (1901), 

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

 France, xvi. 1904, p. 334. 



Depth of body equal to length of head, 3 J 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 postocular part of 

 head ; eye 3 times in lengt?i of head, exceeding interorbital width, nearly 

 twice as long as least preeorbital depth ; mouth small, J 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. 



T'dapia 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 eraarginate. Caudal peduncle 1^ times as long as deep. Scales 

 very indistinctly denticulate, 40 ^^ ; 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). 



