THE ECONOMIC MOLLUSCA OF ACADIA. 69 



Island, 1861, mentions Scallops, " with large ribbed shell, 

 and serrated edge," as occurring on the coast of Prince 

 Edward Island. This description would apply both to this 

 .species and the following, but better to the latter than the 

 former.] Probably rather common on Bay of Fundy and 

 Atlantic coasts, and much less so in the Clulf of St. Lawrence. 



Habits. This is a more northern species than the last and less 

 abundant in our waters. It is much smaller than the latter, rarely 

 exceeding four inches in diameter and is readily distinguished from it 

 by its raised radiating ribs, fifty to one hundred in number, which bear 

 ■ closely crowded, transverse, erect scales. The "ears" or triangular 

 projections from the valves which form the hinge, are unequal in size 

 and shape in this species, though equal in P. temikostatus. In habits it 

 appears to resemble the latter very closely, living in perhaps more 

 rocky situations, but moving, taking its food and so on, in the same 

 way. 



Economics. In its usefulness to man, this species cannot 

 be distinguished from Pecten tenuicostatus. It is equally 

 good for food and its shells may be used for the same purposes. 

 Willis tells us that he has known it to be sold with the latter 

 for one shilling sterling, each, in the Halifax market, and 

 that it is quite as delicate food. Its greater scarcity must 

 make it much less valuable. It is probably never taken 

 separately from its larger relative, and is not distinguished 

 from it by the fishermen. 



13. Pecten irradians Lamarck. 



Pecten concentricus Say. 

 Scallop. 



[Pecten, a comb; irradians, radiating.] 



DiSTKiBUTiON. (a) General; — Low-water mark to thirty 

 •or forty fathoms. Gulf of Mexico and Florida, north to 

 Massachusetts Bay. Sable Island. 



{b) hi Acadia; — Reported only from Sable Island, by John 

 Willis. 



