112 HELICID^. 



by a blackish spot a little behind the large tentacle of 

 the right side. Length about twice the breadth of the 

 sheU. 



Shell, sub-globose ; epidermis shining, smooth, oli- 

 vaceous-yellow, very rarely with rufous horizontal bands 

 or lines ; whorls five, convex ; spire somewhat elevated ; 

 suture, at the extremity of the last whorl, curved towards 

 the aperture ; Up slightly reflected, white, obsolete on 

 the base, with the margin thickened internally ; aperture 

 rounded, sUghtly contracted at the base by the thickening 

 and indentation of the lip ; umbihcus covered, indented ; 

 base convex. 



Greatest transverse diameter three-quarters of an inch. 



Geographical Distribution. Inhabits the eastern 

 part of Massachusetts, near the sea. Is common on the 

 lower parts of Cape Cod, and on Cape Ann, and is very 

 abundant on Salt Island, a rocky, uninhabited islet near 

 Gloucester. It is also said to occur in the northei-n 

 part of Vermont, in Maine, Canada on the St. Law- 

 rence, Nova Scotia, and the islands of St. Pierre and 

 Miquelon. 



Remarks. This species was formerly described by 

 me as Helix siib-globosa, from the belief that its distinctive 

 characters were so strongly marked as to separate it from 

 Selix hortetisis of Europe. I am now convinced of its 

 identity with the latter species, and beheve its origin, in 

 this country, to be due to the constant commercial inter- 



