SILUR0S, 247 



The dorfal fin Is fmall, having only three rajs ; ftom 

 the anus to the middle of the tail, there is a very long 

 fin, fupported by twenty rays ; the pedoral fins have 

 each a flrong fpine projeiEting from the firft ray, whicli 

 the animal probably ufes as an inftrument of defence. 



