The Astartes 



The inner margin of each valve is crenulated. Diameter, i to 

 I J inches. 



Habitat. — New York northward. 



Dr. Dall puts this into sub-genus Venericardia.a name that im- 

 plies relationship with Venus and Cardium, and reports the species 

 from the arctic seas to Cape Hatteras, in deep water. It is also 

 found on the Pacific coast, from Alaska. Professor Keep describes 

 a few closely related forms of Venericardia, all thick-shelled and 

 from cold or very deep water. 



372 



