North American Helices. 



IT 





Pfeiffer, 1855. 



Albers, 1860. 





Malak. Blatt. 



Die Heliceen. 





Gen. Helix. 



Gen. Helix. 





Subgenera. 



Subgeneru. 



avara Say 



Daedalocheila 



Polygyra 



espiloca Rav. 



z= 



= 



Postelliana Bid. 



= 



_= 



auriculata Say 



t( 



ii 



iivulifera Shuttl. 



t( 



u 



Ariadnge Pfr. 



He 



t( 



it 



hippocrepis Pfr. 



(( 



« 



pustula Per. 



Isogonostoma 



Stenotrema 



tholus W. G. Binn. 



zzz 



= 



" var. Mooreana W. G. B. 



— 



-_ 



Dorfeuilliana Lea 



Ulostoraa 



= 



Troostiana " 



Daedalocheila 



Polygyra 



fastigans L. W. Say 



i( 



*< 



Hazard! Bid. 

 • * 



= 



== 



leporina Gould 







Stenotrema 



pustuloides Bid. 



= 



= 



monodon M. & Rack. 



Ulostoma 



« 



barbigera Redf. 



= 



a 



Edvardsi Bid. 



= 







spinosa Lea 



Tridopsis 



ii 



Edgariana Lea 



(( 



u 



stenotrema Per. 



::=: 



i( 



hirsuta Say 



i( 



li 



labrosa Bid. 



;:;::: 



__ 



maxillata Gould. 



(t 



u 



vultuosa Gould 



Ulostoma 



Triodopsis 



introferens Bid. 



= 



= 



inflecta Say 



Isogonostoma r< 



t( 



Rugeli Shuttl. 



= 



a 



fMullani Bid. k Coop. 



= 



=— 



Hopetoneusis Shuttl. 



Ulostoma 



u 



tridentata Say 



a 



a 



fallax " 



i{ 



u 



palliata " 



{( 



11 



obstricta " 



(( 



u 



appressa " 



(( 



« 



elevata " 



Mesodon 



u 



