SYNODONTIS. 



399 



of head 

 maxillar 



, twice in interorbital width; lips moderately developed ; prse- 

 y teeth forming a long and moderately broad band ; movable 



Fig. 302. 



mandibular teeth about \ diameter 

 of eye, forming a long series, about 

 75 in number. Maxillary barbel not 

 margined, a little longer than head, 

 extending a little beyond base of 

 pectoral spine ; mandibular barbels 

 short, outer about j length of head, 

 with simple branches, inner shorter 

 and with ramified branches. Gill- 

 opening not extending downwards 



Sijnodontis polyodon. 

 After Vaillant, I. c. \. 



beyond root of pectoral spine. Occipito-nuchal shield with feeble 

 vermicular rugosities, obtusely tectiform, a little broader than long, with 

 posterior processes obtuse. Humeral process striated, keeled, longer 

 than deep, acutely pointed. Skin villose on sides. Dorsal I 7 ; spine 

 nearly as long as head, striated, smooth in front, feebly serrated behind. 

 Adipose dorsal 3|- times as long as deep, about 1^ times as long as its 

 distance from rayed dorsal. Anal III 8, obtusely pointed in front. 

 Pectoral spine as long as head, strongly serrated on both sides, especially 

 on the inner. Ventral not reaching anal. Caudal deeply notched. 

 Caudal peduncle as long as deep. Brownish ; caudal with traces of dark 

 spots forming four or five transverse series. 



Total length 175 millim. 



Ogowe. — Type in Paris Museum. 



