80 Mr. G. A. Boulenffer on 



XII. — Descriptions of Four new African Freshwater 

 Fishes. By G. A. BoULENGER, F.R.S. 



Gnathonemus Ahadii. 



Depth of body 85 times in total length, length of head 5^ 

 times. Head very slightly longer than deep, with feebly 

 curved upper profile ; snout ^ the length of the head ; mouth 

 small, on a line with lower border of eye ; chin with a globular 

 dermal appendage ; teeth minute, conical, 3 in the upper 

 jaw, 5 in the lower ; eye rather large, f the length of the 

 snout, which equals the interocular width. Dorsal 35, 

 originating very slightly in advance of anal, its length 1| in 

 its distance from the head. Anal 34, slightly nearer the root 

 of the caudal than the base of the ventral, as long as the 

 head. If as long as the ventral, reaching far beyond the base 

 of the latter. Caudal scaled in its basal half, with pointed 

 lobes. Caudal peduncle 3^ times as long as deep, as long as 

 the head. 98 scales in the lateral line, ^ '\n 2i transverse 

 series on the body, ^ in a transverse series between dorsal 

 and anal, 16 round caudal peduncle. Brownish above, 

 silvery white beneath. 



Total length 240 millim. 



A single specimen from Djebba, Upper Niger, presentud to 

 the British Museum by Capt. G. F. Abadie. 



A very distinct species, more nearly allied to O. Ussheri^ 

 Gthr., and G. Greshoffi, Schilth. 



Barilius Loati. 



Depth of body equal to length of head, 4 times in total 

 length. Head twice as long as broad; snout obtusely 

 pointed, projecting strongly beyond tlie lower jaw, 1^ to 

 twice as long as the eye, the diameter of which is contained 

 5 to 6 times in the length of the head, 1^ to twice in the 

 interocular width ; mouth extending to below the posterior 

 third of the eye ; no barbels ; the naked space between the 

 prjeopercle and the suborbitals about ^ the width of the 

 latter. Gill-rakers very short, rudimentary. Dorsal III 

 7-8, originating at equal distance from the occiput and the 

 root of the caudal, or a little nearer the latter, the second half 

 of its base above the anal ; its anterior rays longest, f to f 

 the length of the head. Anal III 13-15, notched, the ante- 

 rior rays much longer than the others, about as long as the 



