398 



silueid^:. 



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 longer 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 



Fig. 301. 



Synodontis 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 tnillim. 



Congo.— Types in Congo Museum, Tervueren. 

 1-2. Two of the types. Leopoldville. 



Oapfc. Wilverth (C). 



2. SYNODONTIS POLYODON. 



Vaill. 0. R. Soc. Philom. 1893, p. 48, and N. Arch. Mus. (3) viii. 1896, p. 127, 

 pi. xi. fig. 1. 



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, 6| times in length 



