INGEESOLL ON KOCKT MOUNTAIN MOLLUSKS. 131 



Zonites arboreus, Say. 



Localities : American Forl<; Cauon, Walisatch Moilntains, Utah : Sum- 

 mit Canon, Mt. Xebo, Utah. 



Zonites fulvus, Drapernand. 



Localities : American Fork Canon, Wahsatch Mountains, Utah ; Sum- 

 mit Canon, Mt. Nebo, Utah ; Empire, Col. 



Pattila Cooperi, W. G. Binney. 



Localities : Summit Canon, Mt. Nebo, Wahsatch Mountains, Utah ; 



[Floyd's Hill, Clear Creek, Col. ; Canon City, Col.] 



These specimens present the usual difference of size, shape and mark- 

 ings, which render it so difficult to determine between this species and 

 three or four closely allied forms. 



[Of this species I have found the dead shells in great abundance, and 

 very widely distributed, both in Colorado and in Utah. On the moun- 

 tains near Summit Canon, Utah, I often found the dead shells among 

 barren rocks, at a height of from 8,000 to 10,000 feet, and it was only 

 after several weeks searching that I succeeded in finding a few living 

 specimens among the debris in the bottom of some deep crevices at the 

 base of a high rocky cliff. Although it was in the latter part of August, 

 these had all hibernated. It seems very probable that this species may 

 hibernate, both for cold and for dry seasons.] 



Patula striatella, Anthony. 



Localities : American Fork Canon, Wahsatch Mountains, Utah ; Fort 

 Bridger, Wyoming Territory; Empire, Col. ; Summit Canon, Mt. Nebo, 

 Utah. 



Vallonia ptilchella, Mailer. 

 J^iocality : American Fork Canon, Wahsatch Mountains, Utah. 



Pupilla muscorum, Linnseus. 

 Locality : American Fork Canon, Wahsatch Mountains, Utah. 



Pupilla Blandi, Morse. 



Locality : Summit Canon, Mt. Nebo, Utah. 



More common throughout the West than the preceding. It was known 

 only as a fossil in the drift along the Upper Missouri, until in 1874 I found 

 it living at various elevated points in Colorado. 



Pupilla alticola, Ingersoll. 



Locality : V 



Several specimens of this well-marked species, discovered among the 

 mountains of South-western Colorado in 1874, are included in the pres- 

 ent collection, but the precise locality unfortunately is unrecorded. They 

 have heretofore been found inhabiting elevations up to the extreme of 

 timber growth, some of my specimens having been obtained above 

 ! 1,000 feet. 



[Found either in the vicinity of Empire City, Col., or among the Wah- 

 satch Mountains of Utah.] 



