368 Notice of Land and Freshwater Shells. 



of shells collected bj Dr. Cooper on the east side of Mullan's 

 Pass, in the Rock}^ Mountains, W. T., Lat. 46" 30' N., at an 

 elevation of 5500 feet. 



The shells, however, attain a very much larger size than 

 those described by Mr. Binney, — his (5 whorls) are diam. maj. 

 15, min. 13, alt. 9 mill., whereas Dr. Cooper's specimens (6 whorls) 

 measure diam. maj. 25, min. 23, alt. 12 mill. In those before 

 us the outer whorl is little deflected at the aperture, and the 

 shell, altogether larger, is less globose ; the color is also difl:er- 

 ent. Dr. Coopei's examples are generally of a light ash-grey 

 color, the upper part prettily te;-selated with i*eddish brown 

 patches of varied shades, and the last whorl has two bands of 

 the same color, one above and the other below the periphery. 

 The surface in fresh specimens has a granulated appearance, 

 the incremental striae being crossed by nun.erous distinct 

 impressed spiral lines. 



This species has marked affinities with II. strigosa Gould, 

 indeed, on a cursm-y examination might perhaps pass as a 

 variety, but the difference in color and sculpturing, its more 

 elevated spire, and narrower umbilicus, seem to entitle it to 

 specific distinction. 



We find a colorless ioo/":?i specimen, with umbilicus more like 

 that of II. strigosa^ and which may be an elevated form of that 

 species, or a variety of H. Cooperi. 



This species also occurs on the Big Horn Mountains, Nebras- 

 ka ; on the west side of the Wind River Mountains ; and on the 

 Rio Piedra, W. New Mexico. 



Helix solitaria Say Jour. Acad. N. S. Phila. ii., p. 157. 



Dr. Cooper collected many specimens on both slopes of the 

 Coeur d'Alene Mountains, particularly in tlie bush and fern 

 covered openings in the f >reS'S, at elevations exceeding 2500 

 feet. This w^ell known species inhabits a wide area. Say 

 described a single dead example from Lower Missouri. It 



