318 MigheW Catalogue of 



referred to that genus by other writers. I cannot hesitate, 

 therefore, as to the propriety of restoring it to the place where 

 Mr. Couthouy originally placed it. 



Genus Lucina. Brug. 



L. ( Cryptodon,) Jlexuosa, Mont. Turton, Gould. Pelagic. 

 This delicate little shell is often obtained from the stomachs 

 of haddock, taken in deep water, in Casco Bay. 



L. radula 1 Mont. (Gould's Invert. Mass. p. 69 and 70.) I 

 am indebted to Capt. Walden for a perfect specimen of a 

 shell which I suppose may be identical with that referred to 

 by Dr. Gould. Capt. W. obtained it with some other species 

 which gave me equal surprise, at Nashe's island, near Machias. 

 It was thrown on shore by the sea. I do not perceive that 

 it differs, essentially, from West Indian specimens of L. ti- 

 ^erzw«,Lam. It nearly accords with Dr. G.'s description of 

 L. radula, but differs in the hinge margin being slightly curv- 

 ed, in having two cardinal teeth in each valve, and a distinct, 

 lateral tooth, anterior to the beak, in each valve. The nym- 

 phal and umbonial margins in my specimen, are colored by a 

 slight stain of pink, which is not noticed by Dr. G. This, 

 however, may be owing to the fact that his specimens were 

 dead and bleached, — and it may, also, be owing to this cir- 

 cumstance, that the specimens differ so much in the number 

 and perfection of their teeth. 



Genus Cyclas. Lin. 



C similis, Say. This species is found burrowing in mud 

 and sand, in great abundance and perfection, in ponds and 

 brooks, in all parts of the State west of the Kennebeck river. 

 I know nothing of it further east, although I have no reason 

 to doubt that it occurs all over the State. Little stagnant 

 ponds and bayous, where the water is shallow and the mud 

 deep and soft, seem to be the favorite habitations of this spe- 

 cies. 



C. partumeia, Say. This also occurs in great profusion all 

 over the State, so far as I am acquainted. It differs in no re- 



