272 



CICHLID^E. 



4. PETROCHROMIS NYASSJ3. 

 Bouleng. Ann. & Mag. K H. (7) x. 1902, p. 70 ; Pellegr. Mem. Soc. Zool. 

 France, xvi. 1904, p. 352. 



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

 Head 1| times as long as broad ; snout much broader than long, 

 1J times as long as eye, which is 4 times in length of head and 

 ]§ times in interorbital width; mouth extending to between nostril and 

 eye, upper lip very thick ; 4 series of scales on the cheek. Gill-rakers 

 very short, 13 on lower part of anterior arch. Dorsal XIX 8 ; spines 

 increasing in length to the seventh, which measures about -J- length 



Fig. 185. 



J 



PetrocJiromis nyassce. 

 Type. 



of head ; longest soft rays as long as head. Anal III 7 ; third spine 

 thicker but a little shorter than longest dorsal. Pectoral a little longer 

 than head, nearly reaching origin of anal. Ventral produced, extending 

 beyond origin of anal. Caudal truncate, slightly emarginate. Caudal 

 peduncle as long as deep. Scales feebly denticulate, very minute 

 on breast and belly, 35 jy ; lateral lines ^. Olive-brown ; a black 

 opercular spot. 



Total length 185 millim. 



Lake Nyassa. 

 1. Type. L. Nyassa. Trof. J. E. S. Moore (C). 



