344 



HELICID^. 



Geographical Distribution. Found in Massachu- 

 setts, near Cambridge, in considerable numbers ; a few 

 have been received from Stamford, Connecticut. 



Remarks. The simplicity of this shell, so much like 

 immature specimens of some other species, has thrown 

 some question upon the validity of this species. (See 

 Proceed. Bost. Soc. Nat. Hist. I. 105, 106.) Since 

 numerous specimens have been found, and the animal 

 also has been examined, there seems no longer room for 

 doubt. Supposing it to be a young shell, in which the 

 aperture were still imperfect, it would best correspond to 

 P. Croiildii. But that species has fewer whorls, when 

 mature, than this exhibits ; besides, the animal is quite 

 different in form, corresponding in that respect with 

 P. ovata, with which it is more truly allied ; the color 

 of the animal is different, the apices of the shells are alto- 

 gether different, and the habits and localities of the ani- 

 mals as diverse as possible. Moreover, it is found most 

 nbundantly in May and June, a time when none but 

 adult shells of any species occur. It is found in the 

 woods, under moist leaves. It is the analogue of P. 

 edentula of Europe. — [g.] 



