ADDENDUM. 



The foregoing paper relates especially to species of Helix 

 which inhabit Korth America, exclusive of the Pacific Coast 

 and Mexico. I used the term " Pacific Coast" as employed by 

 "W. G. Binney in his " Check Lists" published by the Smith- 

 sonian Institution, in which Lists the species of the " Pacific 

 Coast from the extreme north to Mazatlan" are separated from 

 those of " Eastern North America from the boreal regions to 

 the Kio Grande," the Rocky Mountains being considered as the 

 dividing line of the two faunas. My Catalogue, however, em- 

 braces species (indicated by a f) collected by Dr. J. G. Cooper 

 on the Pacific side of the Rocky Mountains, several of which 

 species occur also on the Eastern side ; I refer particularly to 

 H, arl)OTea^ striatellay and solitaria. Under these circum- 

 stances, and having been requested to do sO', I annex the fol- 

 lowing Catalogue of species arranged in the order adopted by 

 Albers, including those marked = w^hicli he does not mention. 

 I add his descriptions of two Subgenera of Helix which are not 

 represented in Eastern North America. 



Catalogue of the Species of Helix which inhabit North Ame- 

 rica West of the Rocky Mountains^ from the extreme North 

 to the northern limits of Mexico^ exclusive of those marJced f 

 in the preceding Catalogue. 





At.bers, 1860. 







Die Heliceen. 





cultellata Thomson 



= 



This belongs pro- 



fulva Drap. 



Conulus. 



bably to Zonites. 



Newberryana W. G. Binn. 



= 





germ an a Gould 



Stenotrema 





oricata " 



Triodopsis 





vultuosa Gould 



u 





* A Dumber of new species have been discovered in the prosecution of tlie 

 Geological Survey of California and otherwise, specimens of some of which I have 

 received. At a late date descriptions of them had not been published. 



