428 



SILURID.E. 



well-developed marginal membrane at the base, IJ to ]| 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 fnmt, very feebly serrated behind, the 



Fiir. 321. 



Sijnodoittts eai>ti'ras. 

 Type(F. K). 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. Adijjose 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 serrie on inner side, not reaching ventral. 

 Latter ])ointed, reaching origin of anal. Caudal deeply forked, upper 

 lobe produced. Caudal ])eduncle a little deeper than long. Dark grey- 

 brown (olive in life), with a few' round blackish spots on the liead. 



