S62 Notice of Land and Freshwater Shells. 



XXXIY- — Notice of Laud and Freshwater Shells oollected hy 

 Dr. J. G. Cooper in the Rocky Mountains^ etc..^ in 1860. 



Br T. Bland and J. G. Cooper. 

 llead June IT, 1861. 



The shells, wliicli form tlie subject of tliis paper, were col- 

 lected by Dr. J. G. Cooper, during the progress of a military 

 expedition under the command of Major Blake, U.S.A. The 

 party went from St. Louis in the Spring of 1860 by steamboat 

 to Fort Benton, crossed over the mountains from tiiat point to 

 the waters of the Culnmbia River, where it agaiu embarked, 

 and proceeded to the Pacific Coast. 



Dr. Cooper fbrward-ed his notes and specimens to Mr. W. 

 Cooper, who placed them in the hands of Mr, T. Bland witli a 

 view to the preparation of the subjoined notice. 



Helix Townsendlaiia Lea, Trans. Anier. Phil, Soc, vi. 99, pi. 



23, f. 80. 



This species was brought by Mr. Nuttall, Dr. Townsend, and 

 tlie United States Exploring Expedition from the neighborhood 

 of the Wahlamat, near its junction with the Columbia Iliver. 

 Dr. Cooper collected many examples, varying much in size, but 

 none so large as tliose which we have seen from Oregon. 



The following is a coj)y of his note on the specimens, — " The 

 numerous small specimens were fi>und in the dry prairie at the 

 junction of Hell Grate and Bitter Root Rivers, and as I met with 

 larger ones of various sizes in more damp situations of the 

 woods, from an elevation of 4800 feet down to 2200 feet, at the 

 base of the Bitter Root Range, I presume that the former is a 

 dwarfed variety, such as is found also west of the Coast Moun- 

 tains in Washington Territory. This is the most wide-spread 

 species I hare seen." Other specimens forwarded b}' Dr. 



