158 THE TANGANYIKA PROBLEM. 



10. Barbus serrifer. — Blgr. 1900. (Fig., p. 207, lower.) 



Depth of body 3 to 3.} times in total length, length of head 4 to 4.3 times. Snout 

 rounded, not projecting beyond the lower jaw, as long as or a little longer than the 

 diameter of the eye, which is contained 4 to 4^ times in the length of the head 

 and 1 \ to \h times in the interocular width ; mouth small, with two pairs of 

 barbels, the posterior of which are the longer, and measure twice the diameter of 

 the eye. Dorsal III. 7 ; third ray very strong, ossified, serrated behind ; the fin, 

 which is equally distant from the eye and from the caudal, is not notched, and the 

 largest ray is a little shorter than the head. Anal III. 5 ; the longest ray § the 

 length of the head. Pectoral | to § the length of the head, reaching, or nearly 

 reaching, the base of the ventral, the last ray of which falls under the first of the 

 dorsal. Caudal forked. Caudal peduncle 1^ to if as long as deep. Scales 



28-30 ^ — iS 3 between the lateral line and the root of the ventral. Olive-brown 



above, silvery white beneath ; a greyish stripe along each side of the body above 

 the lateral line ; a small blackish spot at the base of the caudal. 



Total length, 120 millim. 



Described from three specimens from the north end of Lake Tanganyika. 



Allied to B. kessleri, Stdr. Distinguished by the smaller eye, the longer barbels, 

 the more numerous scales, and the presence of only 7 branched dorsal rays. 



11. Barbus tropidolepis. — Blgr. 1900. (Fig., p. 161.) 



Depth of body 3 times in total length, length of head 4 to 45 times. Snout 

 broad and rounded, strongly projecting beyond the mouth, i|- to twice as long as 

 the diameter of the eye, which is contained 4^ to 5^ times in the length of the head 

 and 2 to 2.h times in the interocular width ; mouth small, inferior ; a minute barbel 

 almost entirely concealed in the angle of the lips. Dorsal III. 9 ; third ray very 

 strong, ossified, not serrated, its length at least f that of the head ; the fin, which 

 is equally distant from the occiput and the root of the caudal, is notched. 

 Anal II. 5 ; the longest ray about | the length of the head. Pectoral about \ the 

 length of the head, not reaching the base of the ventral, the first ray of which falls 

 under the origin of the dorsal. Caudal forked. Caudal peduncle 1^ to if as long 



as deep. Scales 44-46— t' 5 between the lateral line and the root of the ventral ; 



O.T 



in breeding specimens, the scales, those at least which are above the lateral line on 

 the caudal portion of the body, bear a median swelling or obtuse keel, these keels 

 forming together very regular longitudinal lines. Olive above, silvery white 

 beneath. 



12. Barilius moorii. — Blgr. 1900. (Figs., p. 208, 209, lower.) 



Depth of body equal to length of head, 4 times in total length. Head a little 

 over twice as long as broad, with slightly curved upper profile ; snout pointed, not 

 extending beyond the lower jaw, as long as or a little longer than the diameter of 



