CONCHOLOGY. 



This remarkable shell bears some resemblance to that singular 

 Conchological production, the Hammer-Oyster, from which it, how- 

 ever, differs in having the anterior lobe at the upper part of the 

 shell shorter, and in being nearly destitute of the opposite, or cor- 

 responding lobe. Still they may possibly be mistaken, unless due 

 attention be paid to the structure of the hinges, for in that particular 

 no two shells can be more remote. The sulcations of the hinge in 

 our present species are especially characteristic. 



