398 



SILUEID.E. 



moderately long branches with tubercular ramifications, outer a little 

 longer than inner and § length of head. Gill-opening not extending 

 downwards beyond root of pectoral spine. Occipito-nuchal shield 

 smooth, convex, only a little longsr than broad, with posterior processes 

 sharply pointed or obtuse. Humeral process feebly striated, narrow and 

 sharply pointed, extending as far back as occipito-nuchal process. 

 Dorsal I 7 ; spine not very strong, hardly § length of head, smooth in 

 front, feebly serrated behind. Adipose dorsal 4 to 5 times as long as 

 deep, 2^ to 3^ times as long as its distance from rayed dorsal. Anal 

 III 8-9, rounded. Pectoral spine as long as or a little shorter than 



Tig. 301. 



Syuodontis caudalis. 

 Type (A. M. C). f . 



head, strongly serrated on both sides, especially behind. Ventral nearly 

 reaching anal. Caudal deeply notched, both lobes produced into a long 

 filament. Caudal peduncle deeper than long. Uniform brownish. 



Total length 140 millim. 



Congo. — Types in Congo Museum, Tervueren. 

 1-2. Two of the types. Leopoldville. Q 4 ,t. Wilv.rth (C). 



2. SYNODONTLS POLYODON. 



Vaill. C. II. Soc. Philom. 1893, p. 48, and N. Arch. Mus. (3) viii. 1896 p. 1*7 

 pi. xi. fig. 1, j I • - ) 



Depth of body 4| times in total length, length of head 4 times 

 Head slightly longer than broad, with feeble vermicular rugosities above- 

 snout rounded, | length of head ; eye supero-lnteral, 5| times in length 



