220 
TEAVELS IN CENTEAL AFEICA. 
posterior which is adipose ; anal long. A hand of villiform teeth 
across the vomer; cleft of the mouthy the eight barbels,, the arma- 
ture of the head^ the gill- apparatus with the accessory organs,, the 
ventral and pectoral fins^ as in Clarias. 
These fishes are extremely similar to Clarias, and attain to the 
same large size. 
Heterobranchus bidorsalis, Geofir. 
B. 12—13. D. 44. A. 52. P. 1/10. 
The length of the adipose fin is rather less than two-thirds of the 
rayed dorsal ; pectoral spine slightly serrated. The nasal barbels 
are half as long as those of the maxillary^ which reach only to the 
gill-opening. Vomerine teeth villiform^ forming a crescentic band. 
Heterobranchus intermedins, Gthr, 
B. 9. D. 39— 41. A. 49— 50. P.1/10. 
The length of the adipose fin is rather less than two-thirds of 
that of the rayed dorsal; pectoral spine scarcely serrated. The 
nasal barbels extend to,, or beyond,, the end of the occipital process,, 
those of the maxillaries beyond the root of the ventral fin. Vo- 
merine teeth villiform^, forming a crescent-shaped band^ which,, in 
its middle, is much broader than that of the intermaxillaries,, and 
which has a short median posterior process. Blackish above^, 
whitish below. Otherwise very similar to the preceding species. 
