THE TANGANYIKA PROBLEM. 
2 1 6 
90. Mastacembelus tveniatus. — Blgr. 1901. (Fig. p. 213. Middle.) 
Depth of body 13 times in total length, length of head 6.4 times. Vent equally 
distant from head and from caudal fin, separated from head by a space equal to 3 
times length of latter ; snout twice as long as eye, ending in a trifid appendage 
as long as latter ; buccal cleft extending to below anterior border of eye ; no 
prieopercular spines. Dorsal and anal fins confluent with caudal, which is short 
and rounded ; dorsal XXXIII. 85; anal II. 85; first anal spine extremely short, 
second as long as last dorsal. Pectoral £ length of head. Scales extremely small, 
25 between origin of dorsal and lateral line. Yellowish, a brown lateral band from 
the end of the snout, through the eye to the caudal region, where it widens, its 
borders become sinuous, and it bears some yellow spots. 
Total length, 105 millim. 
Described from a single specimen from north end of Lake Tanganyika. 
91. Mastacembelus ophidium. — Gthr. 1893. 
