318 



SILUEID^E. 



root of caudal as from end of snout; spine rather feeble, serrated 

 behind, -| length of head ; first soft ray longest, f to f length of head. 

 Adipose dorsal 2 to 3 times as long as deep, its base equal to or a little 

 longer than that of the rayed dorsal, from which it is separated by a 

 space equal to 3 or 4 times its base. Anal 14, 10 rays branched. 



Fig. 250. 



<Bm®W@&^!$- 



Chrysichthys sianenna. 

 Type (Tr. Z. S. 1906). f . 



Pectoral spine about f length of head, feebly serrated on outer side, 

 more strongly on inner side. Caudal deeply forked, with pointed lobes, 

 longest rays 3 to 3^ times length of median. Caudal peduncle twice as 

 long as deep. Olive above, silvery white beneath. 



Total length 220 millim. 



Lake Tanganyika. 



1-2. Types. Niamkolo. Dr. W. A. Cunnington (C). 



3. Type. Mbete. 



2. CHRYSICHTHYS SHARPII. 



Bouleng. Ann. & Mag. N. H. (7) vii. 1901, p. 81, and Poiss. Bass. Congo, p. 281 

 (1901). 



Depth of body 5^ times in total length, length of head 4 times. 

 Head much depressed, 1\ times as long as broad, feebly granulate 

 above; occipital process a little longer than broad, extending to the 

 small interneural shield ; snout broadly rounded, projecting a little 

 beyond lower jaw, -| length of head; eye oval, 6 times in length of head 

 and twice in interorbital width ; width of mouth twice in length of 

 head ; prremaxillary band of teeth curved, 6 times as long as broad ; 

 vomero-pterygoid band narrow, crescentic, scarcely interrupted in the 

 middle; nasal barbel § diameter of eye; maxillary barbel f length of 



