324 



Annals of the South African Museum. 



Mormyrops tuckeyi, Marcusen, Bull. Ac. St. Petersb., xii., 1854, 

 p. 14. 



Mormyrops deliciosus, Bouleng., Cat. Fresh. Fish. Afr., i., p. 32 

 (1909). 



" Teeth conical or truncate in the adult, more or less distinctly 

 notched in the young, 24 to 36 in each jaw. Depth of body 5 to 6| 

 times in total length, length of head 3| to 4J times. Head nearly 

 twice as long as deep, upper profile slightly concave; snout rounded; 

 jaws equal ; width of mouth nearly equal to length of snout ; eye 

 small, in anterior third of head, its diameter 2 (young) to 4 times in 

 length of snout or in interocular width. 



Dorsal 21-27, i to f length of anal, originating 2 to 2i- times as 

 far from end of snout as from base of caudal. Anal 40-51, origi- 



FIG. 2. Mormyrops delicioms. 



nating considerably in advance of dorsal (its 12th to 16th ray corre- 

 sponding to the first dorsal ray) and a little nearer to head than to 

 root of caudal. Pectoral rounded, ';- to 4- length of head, ventral 

 i to J. Caudal rather small, densely scaled, with rounded lobes; 

 caudal peduncle 2 to 2^ times as long as deep, ^ to ^ length of head. 

 85-100 scales in lateral line, ^| in transverse series on body, 22-26 

 in transverse series between dorsal and anal, 14-18 round caudal 

 peduncle. 



Colour, brownish or olive above, silvery beneath. 



Total length 1500 mm. 



Habitat : Zambezi, Lake Nyassa, Senegal, Gambia, Niger, Chad 

 Basin, Congo, Wedi Shebeli and Juba." 



2. PETROCEPHALUS. 



Petrocephalus, part., Marcusen, Bull. Ac. St. Petersb., xii., 1854, 

 p. 14. 



Mormyrus, part., Giinth., Cat. Fish., vi., p. 214 (1866). 

 Petrocephalus, Bouleng., Cat. Freshw. Fish. Afr., i., p. 47 (1909). 



