PETHOCEPHALUS. \ 57 



y^ ill transverse series on boily, ,j in transverse series between dorsal and 

 anal, 12 round caudal peduncle. Silvery, back dark brown. 



Total length 85 millim. 



Kingani River, East Africa. 



1. Type. Kiiigani R. Dr. Stuhlinann (C); 



Berlin Museum (E. ). 



9. PETROCEPHALUS CATOSTOMA. 



Mormt/nis catosto)i}a, Giinth. Cat. Fish. vi. p. 222 (18(j()). 

 Petrocephalus catostoma, Bouleng. Proc. Zool. Soc. 18D8, p. 790. 



Depth of body 3 to 3^ times in total length, length of head o^ to of 

 times. Head as long as deep, with convex upper profile ; snout very 

 short, I length of head, rounded, projecting beyond mouth ; moutli 

 situated below eye, its width \ length of head; teeth bicuspid, 12-1 i 



Fig. 42. 



Petrocephalus catostoma. 

 Type. 



in upper jaw, 18-20 in lower; eye large, at least as long as snout, at 

 least I interorbital width. Dorsal 20-22, originating above 4th or 5th 

 ray of anal, its length hardly half its distance from head. Anal 25-29, 

 equally distant from base of ventral and from base of caudal. Pectoral 

 pointed, nearly | length of head, twice as long as ventral, and extending 

 beyond base of latter. Caudal with pointed lobes. Caudal peduncle 2\ 

 to 3 times as long as deep, a little shorter than head. 37-40 scales in 

 lateral line, j^^^ in transverse series on body, j^j£y-j in transverse series 

 between dorsal and anal, 16 round caudal peduncle. Silvery, back 

 blackish. 



Total length 55 millim. 



Rovuma River and Lake Nyassa. 



1-5. Types. Rovuma River. Dr. C. Livingstone (P.). 



6- Ad. Between Kondov^-e and Karonga, Sir H. H. Johnston (P.). 



X. of L. Nyassa. 



