322 MigheW Catalogue of 



this shell in its stomach. I think I have taken more than one 

 hundred out of a single individual. It occurs on all the coast, 

 and as far north as Labrador. 



Genus Cardita. Lam. 



C lor calls, Con. Pelagic. I have taken this species by 

 the dredge in Portland harbor, and immature specimens are 

 common in fishes' stomachs taken in Casco Bay. Capt. Wal- 

 den has dredged it as far east as Lubec, and Dr. Ray has 

 found it at Eastport. I have, also, found it among the shells 

 from the Gulf and the Banks. 



Genus Arca. Lin. 



A (Species nnknown.) A single valve, of a species 



strongly resembling A. staminea, Say, was brought to me with 

 other well known species, by a fisherman, from the Gulf of 

 St. Lawrence. I am not aware that any species of this genus 

 has ever been detected, before, north of Cape Cod. Having 

 found only this odd valve, I have hesitated as to the propriety 

 of describing it, or of affixing to it a specific name, — if, how- 

 ever, future researches should establish its northern habitat, 

 and it should prove to be distinct, I would name it A. gla- 

 cialis. 



Genus Nucula. Lam. 



As will abundantly appear, this genus is numerously repre- 

 sented in Casco Bay. The species are all pelagic, and for all, 

 with the exception of N. limatula, we are dependent on the 

 stomachs of fishes, and of this (N. limatula,) even, immature 

 specimens are not un frequently found in company with all the 

 other species. 



N. limatula, Say. This fine species occurs in Portland har- 

 bor in great perfection, though not so abundant as might be 

 inferred from an incidental remark by Dr. Gould (Invert. Mass, 

 p. 9S.) Three men, with a good dredge and boat, by work- 

 ing hard a whole summer's day, would do well to obtain thirty 

 specimens. I doubt not that the shells are plenty enough, but 



