270 



CrCHLID.E. 



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 Albert and Tanganyika. 



Fig. 183. 



Fetrochromis cmdersonii. 

 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. ^tappers (C). 



3. PETROCHROMIS POLYODON. 



Boiilen;>. 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. 190G, p. 573. 



Depth of body 2J to 3 times in total length, length of head 2f 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 IJ to 2 times in interorbital width; mouth 



