TILAPIA. 



265 



93. TILAPIA BOOPS. 

 Bouleng. Ann. & Mag. N. H. (7) vii. 1901, p. 5, Poiss. Bass. Congo, p. 47G 



(1901), and Tr. Zool. Soc. xvi. 1901, p. 158, pi. xix. fig. 5. 

 Oplithalmotilapia hoops, Pellegr. Mem. Soc. Zool. France, xvi. 1904, p. 3l5. 



Depth of body equal to length of head, 3J to 3J times in total 

 length. Head twice as longas broad ; snout short and rounded, with 

 strongly convex upper profile, broader than long, as long as postocular 

 part of head ; eye 2J times in length of head, a little exceeding inter- 

 orbital width, more than twice as long as least prseorbital depth ; mouth 

 small, subinferior, f width of head, not extending quite to below anterior 

 border of eye ; teeth very small, tricuspid, in 3 series, about 70 in outer 

 scries of upper jaw ; 2 or 3 series of scales on the cheek, width of scaly 



Fig. 180. 





Tdajjia boops. 

 Type(Tr, Z. S. 1901). 



part not half diameter of eye. Gill-rakers short, 13 on lower part of 

 anterior arch. Dorsal XII-XIII 14 ; spines feeble, equal in length 

 from the seventh, which measures nearly J length of head ; soft rays 

 scarcely longer. Anal III 8-9 ; third spine as long as and stronger 

 than dorsals. Pectoral as long as head, reaching origin, of anal. 

 Ventral produced into a filament, extending beyond origin of anal. 

 Caudal with deep crcscentic notch. Caudal peduncle nearly twice as 



long as deep. Scales feebly denticulate, 39-40 ]jz[^; lateral lines j^^z^- 

 Brown above, white beneath ; a blackish opercular spot. 



Total length 90 millim. 



Lake Tanganyika. 

 1-2. Types. Msamlni. Prof. J. E. S. Moore (C). 



