The Freshwater Fishes of South Africa. 



335 



equal distance from eye and from root of caudal, longest ray nearly 

 as long as head. Anal iii 9, equally distant from root of ventrals 

 and from root of caudal. Pectoral | length of head. Caudal deeply 

 forked, with pointed lobes. Caudal peduncle twice and \ as long as 

 deep. 95-100 scales in lateral line. Yellowish to dark brown 

 above, whitish beneath ; a lateral series of black dots ; a black dot 

 at base of ventral and usually two at base of anal. 



Total length 90 millim. 



Angola. Type in Vienna Museum." 



FIG. 10A. Kneria angolensis. 

 (From Brit. Mus. Cat. Air. Fishes.) 



A single specimen, 52 mm. in length, has been obtained by the 

 Bulawayo Museum from the Zambezi Eiver. Unfortunately it is not 

 in a good condition for examination, but although it differs in some 

 respects from the description notably, in possessing a broad mental 

 flap on lower jaw, fewer dorsal and anal rays, and has the eye 

 slightly nearer to point of snout it has been referred to this species 

 until an examination of further specimens proves whether the 

 differences are constant and represent a new species. 



FAMILY CHARACINID^. 



Synopsis of Genera. 



1. HYDROCYONIN;E. Dentition powerful ; upper jaw immovable or slightly movable ; 

 maxillaries well developed, bordering the mouth ; gill-membranes free or very 

 narrowly attached to isthmus ; scales not ciliated ; lateral line nearer ventral 

 than dorsal outline. 



A. Teeth unicuspid. 



Teeth very numerous, unequal, conical, in two series; dorsal fin 



well behind ventrals 1- Sarcodaces. 



Teeth not very numerous, compressed, uniserial ; dorsal fin above 



ventrals 2 - Hydrocyon. 



B. Teeth plurieuspid, in 2 or 3 series in the upper jaw. A pair 



of conical teeth behind the plurieuspid teeth of the lower jaw. 

 Teeth in 2 series in the upper jaw, the inner with obliquely trun- 

 cated or molariform excavated crowns ; dorsal fin originating 

 above or behind ventrals 3. Alestes. 



