338 Mighels' Catalogue of 



N. triseriata, Say. Littoral, abundant, and found in com- 

 pany with the preceding. 



N. immaculata, Tott. Pelagic, found in plenty in the sto- 

 machs of haddock taken in Casco Bay. 



N. pusilla, Say. Pelagic, found sparingly, with the pre- 

 ceding. 



N. clausa, Brod. and Sovvb. (iV. consolidata, Couth.) Found 

 very plentifully, in company with the two preceding species. 



N. Jlava, Gould. Pelagic, taken from fishes' stomachs, 

 rarely, in the Gulf of St. Lawrence. 



Genus Velutina. Blain. 



V. laevigata, Lin. Pelagic, found somewhat plentifully in 

 the stomachs of haddock taken in Casco Bay. When mature, 

 it accords perfectly with European specimens. A specimen 

 now before me, found by Capt. Walden, at Nashe's Island, is 

 .7 inch in length, and .6 inch in width. 



V, zonata, Gould. Found in company with the preceding 

 species. Rare. 



Genus Sigaretus. Lam. 



S. haliotoideus, Lin. Pelagic. Very rare. Found in 

 fishes' stomachs taken in very deep water, in Casco Bay. The 

 animal is of a pure white, and entirely encloses the shell. It 

 accords in most respects with Montagu's description, (^British 

 Shells, p. 212, 213) excepting in color. 



Genus Skenia. Flem. 



S. serpuloides, Mont. Littoral, — found occasionally cling- 

 ing to the under side of wet stones, above low-water mark. 



Genus Scalaria. Lin. 



S. grcenlandica, Chemn. Pelagic, — very rarely found in 

 fishes' stomachs caught in Casco Bay and Gulf of St. Law- 

 rence. 



