HETEEOBEANCHUS. 



275 



Dorsal 29-34, its distance from occipital process y to ^ length of head ; 

 adipose dorsal as long as or a little shorter and lower than rayed dorsal, 

 commencing immediately behind or at a short distance from the latter. 

 Anal 44-54, extending, like the adipose dorsal, to the base of the 

 caudal fin. Pectoral f to ^- length of head, the spine feebly serrated 

 on the outer border and measuring \ (young) to f the length of the 

 fin. Ventral midway between end of snout and base of caudal, or a 

 little nearer the latter. Caudal ^ to f length of head. Olive above, 

 white beneath, sometimes with scattered black blotches; dorsal and 

 anal fins pale olive, darker towards the edge, which may be margined 

 with red ; caudal fin yellowish or pale orange at the base, with a more 

 or less distinct blackish crescentic band, sharply defined in front, 

 shading off to yellow or red behind ; adipose dorsal fin often blackish at 

 the end. 



Total length 720 millim. 



Nile, Omo, Niger, Congo, Zambesi. — Type in Paris Museum. 



Fig. 227. 



Heterobranchus longifilis. 



