TILAPIA. 



245 



interoibital width, and a little exceeds least depth of prceorbital ; mouth 

 rather large, | width of head, extending to below anterior border of eye ; 

 teeth small, in 4 or 5 series, 52 in outer series of upper jaw ; 5 or 6 

 series of scales on the cheek, width of scaly part equal to diameter 

 of eye, Gill-rakers short, 12 on lower part of anterior arch. Dorsal 

 XVIII 8 ; last spine longest, ^ length of head, f middle soft rays, 

 which are produced. Anal III 8; third spine nearly as long as last 



Tihipla zel<n(. 

 Vpo (F. Z. S. lSi)9). 



dorsal. Pectoral as long as head, not extending to vertical of origin 

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

 anal. Caudal rounded (1), densely scaled at the base. Caudal peduncle 

 a little deeper than long. Scales finely denticulate, 31 j^; lateral lines 

 jjj^^j ; scales on occiput, nape, breast, and belly very small. Grey, with 

 G dark brown bars ; a crescentic dark brown band on the forehead, 

 from eye to eye, followed by a second farther back, and a third in 

 front of the dorsal ; vertical fins grey ; three round white spots on tlie 

 ]>osterior part of the anal ; ventrals blackish. 



Total length 105 millim. 



Lake Nya?sa. 



1. Type. L. Nyassa. Miss M. Woochvard (C.) ; 



i\Ii'^s S. ('. :\[cr/in^rl,lin (P.). 



17 Bou II/III 



