PETROCEPHALUS. 57 



j3 in transverse series on body, -g in transverse series between dorsal and 

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



Total length 85 inillim. 



Kingani River, East Africa. 



1. Type. Kingani R. Dr. Stuhlmann (C); 



Berlin Museum (E. ). 



9. PETROCEPHALUS CATOSTOMA. 



Mormyrus catostoma, Giinth. Cat. Fish. vi. p. 222 (1866). 

 Petrocephalus catostoma, Bouleng. Proc. Zool. Soc. 1898, p. 790. 



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

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

 short, i length of head, rounded, projecting beyond mouth ; mouth 

 situated below eye, its width \ length of head; teeth bicuspid, 12-11 



Pi-. 42. 



Petrocephalus catostoma. 

 Type. 



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

 least f 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 f 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, ^^ in transverse series on body, ^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 Kondowe and Karonga, Sir H. H. Johnston (P.). 



N. of L. Nyassa. 



