North American Helices. 



31 



Catalogue of the Species of Helix which inhabit Worth Ame- 

 rica {exclusive of the Pacific Coast and Mexico), arranged 

 especially with reference to the forms of the Shells, and show- 

 ing the Genera and Subgenera in which they are placed by 

 Pfeiffer and Albers. 



fuliginosa Griff. 



kopnodes W. G. Binn. 



friabilis " 



caduca Pfr. 



inornata Binn. 



subplana " 



laevigata Raf. 



sculptilis Bid. 

 * 



cellaria Mull, 

 nitida " 



hydrophila Ing. ? 

 farborea " 

 lirnatula Ward 

 viriduia Menke 



electrina Gould 



indentata Say 

 * 



Pfeiffjer, 1855. 

 Malak. Blatt. 



Gen. Helix. 



Subgenera. 

 Hyalina 



Albers, 1860. 

 Die Heliceen. 



Gen. Hyalina. 



Subgenera. 

 Mesomphix 



Ammonoceras 

 Mesomphix 



Hvalina 



Note. — The species marked = in the columns of the above Catalogue are not 

 named by the Authors in the lists quoted. 



