TILAPIA. 



151 



2. TILAPIA SHIRANA. 

 Oreochromis shiranus, Bouleng. Proc. Zool. Soc. 1896, p. 916, fig. ; Pellegr. Mem. 



Soc. Zool. France, xvi. 1904, p. 355. 

 Tilapia shirana, Bouleng. Tr. Zool. Soc. xv. 1898, p. 4, and Proc. Zool. Soc. 1899, 



p. 111. 



Depth of body 2 to 2f times in total length, length of head 3 times. 

 Head If to If times as long as broad ; snout rounded, with straight or 



Pig. 98. 



Head of Tilapia shirana. 

 Type (P. Z. S. 1896). 



slightly concave upper profile, a little broader than long, f to f post- 

 ocular part of head ; eye 4 to 5 times in length of head, If to 2 times 

 in interorbital width, equal to or a little less than prseorbital depth ; 

 mouth moderate, f- to § width of head, extending to between nostril and 

 eye; teeth in 5 to S series, 70 to 100 in outer series of upper jaw; 

 2 or 3 series of scales on the cheek, width of scaly part not greater than 



