270 



CtCHLIDiE. 



darker at the base; a black opercular spot; spinous dorsal and anal 

 with numerous dark horizontal streaks; soft dorsal and caudal with 

 round light spots on a dark ground; soft dorsal edged with bright 

 yellow. 



Total length 420 millim. 



Lakes Albeit and Tanganyika. 



Fig. 183. 



**«SS8fe 





1'etrocliromis aiulersonii. 

 Type(F.N.). f 



Doubtfully distinct from the preceding. — The occurrence in L. Albert 

 needs confirmation. 



1. Type. L. Albert. Prof. J. E. S. Moore (C). 



2. Ad. Kilewa Bay, L. Tanganyika. Dr. L. Stappers (C). 



3. PETROCHROMIS POLYODON. 

 Bouleng. Tr. Zool. Soc. xv. 1898, p. 20, pi. vi. fig. 1, and Poiss. Bass. Congo, 

 p. 479 (1901) ; Pellegr. Mem. Soc. Zool. France, xvi. 1904, p. 352 ; 

 Bouleng. Tr. Zool. Soc. xvii. 1906, p. 573. 



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

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

 broader than long, 1^ to 2 times as long as eye, which is 4 to 5 times 

 in length of head and 1^ to 2 times in interorbital width; mouth 



