KNOBBED SILURB, 15 



top by roughish bony plates, marked into separate 

 divisions, and terminating in a point behind : first 

 ray of the dorsal and of the pectoral fins extremely 

 strong and serrated : beards six : lateral line flexuous : 

 adipose fin small, and placed near the tail, which is 

 short and rounded. Native of South America. 



KNOBBED SILURE. 



Silurus Nodosus. S. olivaceus, subtus argenteus, pinnce dorsalis 



basi gibbosa. 

 Olivaceous Silure, silvery beneath, with the base of the dorsal 



fin gibbous. 

 Silurus nodosus. S. radio primo dorsali nodoso. Block, t. 368* 



LENGTH about a foot : habit lengthened : head 

 and foreparts rather large : eyes moderately large : 

 mouth wide, and furnished with six cirri, of which 

 the two upper ones are of considerable length : 

 lateral line flexuose: first ray of the dorsal and 

 pectoral fins very strong and serrated : tail deeply 

 forked. Native of the Indian rivers. 



