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TEAVELS IN CENTEAL AFEICA. 
Heterotis niloticus, Cuv. [Gischer, Saide.) 
D. 33—34. A. 35—36. L. lat. 35—36. 
Attains to a length of four feet^ and is more common in the 
Upper than in the Lower Nile. Bad eating. Not common in 
European collections. 
AN G U I L L I D JE. 
Anguilla. (Eels.) 
Dorsal^ anal^ and caudal fins united ; pectoral fins present ; ven- 
tral fins none. Scales minute, hidden in the skin. 
Anguilla vidgaris, Cuv. [Sumak al hayydt.) 
The eel is common in the lower Nile; it generally has the snout 
somewhat more pointed than European examples, but individuals 
frequently occur which cannot be distinguished from our common 
eel. This species is easily recognized by the forward position of 
the dorsal fin, the distance between its commencement and that of 
the anal fin being equal to, or even more than, the length of the 
head. 
Anguilla latirostris, Cuv. (The broad-snouted eel.) 
Bifaud gives various figures of eels : one was evidently taken 
from an example of this species, which is distinguished by the back- 
ward position of the dorsal fin, the distance between its commence- 
