ADDENDUM. 



The foregoing paper relates especially to species of Helix 

 which inhabit North 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 Rio 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. arborea, striatella, 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 = which 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 Pocky Mountains, from the extreme North 

 to the northern limits of Mexico, exclusive of those mailed f 

 in the 'preceding Catalogue. 



cultellata Thomson 

 fulva Drap. 



Newberryana W. G. Binn. 

 germana Gould 

 loricata " 

 vultuosa Gould 



Albers, 1860. 

 Die Heliceen. 



Conulus. 



Stenotrema 

 Triodopsis 



This belongs pro- 

 bably to Zonites. 



* A number of new species have been discovered in the prosecution of the 

 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. 



