268 



CICHLIDiE. 



II. 4-6 series oE scales on the cheek; 10-16 gill-rakers on lower part of 

 anterior arch. 

 D. XVII-XIX 8-10 ; A. Ill 7-8 ; Sc. 32- 

 34 jf=™ ; 10-13 gill-rakers ; snout l£-2 



times as long as eye 3. P. polyodon, Blgr., p. 270. 



D. XIX 8 ; A. Ill 7 ; Sc. 35 y| ; 13 gill-rakers ; 



snout 1£ times as long as eye 4. P. nyassa>, Blgr., p. 272. 



D. XVIII-XX 8-9 ; A. Ill 7-8 ; Sc. 32- 



34 



t^-te ; 12-16 gill-rakers ; snout not or 



14-15 ' ° 



but slightly longer than eye 5. P.fasciolatus, Blgr., p. 273. 



Tig. 132. 



Petrochromis tanyanicce. 



1. PETROCHROMIS TANGANIOE. 



Chromts tanyanicce, Giinth. Proc. Zool. Soc. 1893, p. 630, fig. 



Tilapia tanyanicce, Bonleng. Tr. Zool. Soc. xv. 1898, p. 5, and Proc. Zool. Soc. 



1899, p. 113. 

 Petrochromis tanyanicce, Bouleng. Poiss. Bass. Congo, p. 480 (1901) ; Pellegr. 



Mem. Soc. Zool. France, xvi. 1904, p. 351. 



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

 3 times. Head twice or a little less than twice as long as broad ; 

 snout 1|- to H times as long as eye, which is 3| to 4£ times in length 

 of head and If to 2 times in interorbital width ; mouth extending to 

 below nostril or a little beyond ; o series of scales on the cheek, depth 



