58 
THE TANGANYIKA PROBLEM. 
io. Barbus serrifer. — Blgr. 1900. (Fig., p. 207, lower.) 
Depth of body 3 to 3^ times in total length, length of head 4 to 4' 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 ij to ii 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 jj the 
length of the head. Pectoral £ to J 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 ii to 1 4 | as long as deep. Scales 
28-30 4 - ■ -L 1 3 between the lateral line and the root of the ventral. Olive-brown 
5 * ’ 
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. 
ix. Barbus tropidolepis. — Blgr. 1900. (Fig., p. 161.) 
Depth of body 3 times in total length, length of head 4 to 4^ times. Snout 
broad and rounded, strongly projecting beyond the mouth, to twice as long as 
the diameter of the eye, which is contained 4.J to 5.4 times in the length of the head 
and 2 to 2b 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 § 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 f 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 iA to i£ as long 
gi 
as deep. Scales 44-46 -rp 5 between the lateral line and the root of the ventral ; 
o.j 
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 
