428 



SILUEID.E. 



well-developed marginal membrane at the base, 1| to If times as long 

 as head, reaching anterior third or middle of pectoral spine; outer 

 mandibular barbel about twice as long as inner, former with long 

 slender branches, latter with tubercular ramifications. Gill-opening 

 not extending downwards below base of pectoral spine. Occipito- 

 nuchal shield rough like the occiput, obtusely tectiform, with obtuse 

 posterior processes. Humeral process flat, granulate, much longer 

 than broad, obtuse-pointed, extending as far back as occipito-nuchal 

 process, or not quite so far. Dorsal I 7 ; spine strong, feebly curved, 

 longer than head, smooth in front, very feebly serrated behind, the 



Fig. 321. 



Synodontis eupterus. 

 Type(F. K). §. 



soft terminal part, as well as the extremity of the anterior branched 

 rays, prolonged into a long filament, the second soft ray being more 

 than twice as long as head. Adipose dorsal 2^ to 3 times as long as 

 deep, narrowly separated from rayed dorsal. Anal IV 8, pointed. 

 Pectoral spine a little longer than head, moderately serrated on 

 outer edge, with very strong serrae on inner side, not reaching ventral. 

 Latter pointed, reaching origin of anal. Caudal deeply forked, upper 

 lobe produced. Caudal peduncle a little deeper than long. Dark grey- 

 brown (olive in life), with a few round blackish spots on the head, 



