APHREDODERUS, &C. 163 



Aphredoderus, Lessueur. Two edges of the 

 suborbitary bones toothed, furnished with raised 

 spines ; edge of the preopercle toothed, the angle 

 of the opercle with a spine ; the anal fin without 

 spiny rays. A single species only known a 

 native of the fresh waters of North America. 



Centrarchus has the preopercle entire, but 

 the angle of the opercle is divided into two flat 

 points. The most characteristic distinction, and 

 that whence the name is taken, is in the anal fin 

 having numerous spiny rays, amounting to five 

 or six, while, in the other genera, they rarely 

 exceed three. They are found in the fresh waters 

 of North America. By Lacepede, they are placed 

 in the genus JLabrax, while, by the American 

 ichthyologists, a genus has been formed entitled 

 Cychla. 



Priacanthus* is distinguished by the scaling 

 of every part of the mouth, jaws, and cheeks, in 

 which they resemble Anthias, but they want the 

 canine teeth, and have fine teeth on both jaws, a 

 little tuft before the vomer, and a narrow line on 

 each palatine bone. The posterior opening of 

 the nostril is a large vertical slit ; the lower angle 

 of the preopercle is spined. Ten or eleven species 



* Trickodon will be found in another place. 



