48 ANGLING. 



SECTION IV. 



The Osteology of Fishes. 



THE most important characters of the sides of 

 the head are derived from the pre-opercle, and the 

 adjacent parts which form the gill-covers, that is 

 the opercle, the sub-opercle, and the inter-opercle. 

 The head of fishes usually consists of about sixty 

 bones the amount being sensibly greater in such 

 species as have the upper maxillary subject to divi- 



CRANIUM OF PERCH. 



sion. The accompanying cut of the cranium of the 

 perch, with the subjoined enumeration of the parts, 

 will suffice to illustrate the subject with greater 



