82 



P. glaber. The glabrous Scallop. PL 15, fig. 4. 



Species of which the two valves are ribbed and almost 

 equally convex, the right a little less, and having its inferior 

 ear less broad than the left, so as to produce a kind of groove 

 for the passage of the byssus. 



P. JacohcRus. The scallop of St. James. 

 Species very inequivalve ; the left valve being very flat, 

 the right convex ; ears equal. 



P. pleuronectes. The sole Scallop. 



Species equivalve, not closing ; surface smooth and ribbed 

 within ; one valve perfectly white, the other of a brownish 

 or reddish colour. 



