272 



CICHLID.K. 



4. PETROCHROMIS NYASS.E. 



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

 France, xvi. 1904, p. 352. 



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

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

 1^ times as Jong as eye, which is 4 times in length of head and 

 ]f times in interorbital widrh; mouth extending to between nostril and 

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

 very sliort, 13 on lower part of anterior arch. Dorsal XIX 8 : spines 

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



Fig. 185. 



Petrochromis nyasste. 

 Type. 



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



thicker but a little shorter than longest dorsal. Tectoral 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 \j ; lateral lines J|. Olive-brown ; a black 

 opercular spot. 



Total length lS-5 millim. 



Lake Nyassa. 



1- ^>P*^- L. Xja,.sa. Prof. J. E. S. Moore (C). 



