248 
TRAVELS IN CENTRAL AFRICA. 
total length (without caudal)^ the length of the head thrice and 
three -fonrths. Snout as broad as^ or even broader than^ long, 
obtuse in front; lips thick; interorbital space very convex, its 
width being contained twice and one-fifth in the length of the 
head. The lower jaw with twenty or twenty-two teeth. The 
length of the base of the dorsal fin is only three-fourths of that 
of the head ; the distance between the two dorsal fins equals the 
length of the base of the adipose fin. The anal extends to the 
root of the caudal, if laid backwards. Body with large rounded 
blackish spots, each being twice as large as the eye. Dorsal fin with 
sub quadrangular blackish spots, irregularly arranged. 
Upper Nile. 
ICHTHYBORUS. 
Dorsal fin somewhat behind the middle of the length of the 
body, with fourteen or seventeen rays; anal of moderate length; 
ventrals a little in advance of the dorsal; caudal scaly, forked. 
Body compressed, elongate, covered with small scales ; lateral line 
complete. Cheeks naked. Cleft of the mouth wide : the inter- 
maxillaries of both sides coalesce, forming a very moveable flattish 
bone, which is armed with a pair of canine teeth anteriorly, and 
with a series of compressed triangular teeth laterally; its inner 
surface, which forms the anterior part of the roof of the mouth, is 
covered with minute pointed teeth. The dentafies of the mandible 
