130 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



On a Collection of Mollusks from Utah and Colorado. 



BY ERNEST INGERSOLL. 



The following list is a catalogue of an interesting collection of Mol- 

 lusks from Colorado, Utah and Southern Wyoming, made by Mr. J. D. 

 Putnam, a member of the Academy, in the years 1872, 1873 and 1875. 



The collection, although embracing only thirty-two species, is typical 

 of the Molluscan fauna of that region, affords one or two names not 

 hitherto recorded from beyond the Rocky Mountains, and is particularly 

 interesting as including specimens of two species discovered only two 

 years ago in the mountains of Colorado. 



It is of the greatest importance to have collections like the present 

 accurately labelled as to localities and stations, from all parts of the 

 rugged territory between the Rocky Mountains and the Sierra Nevada, 

 for a study of the molluscan life of no other part of North America is 

 likely to yield more aid in elucidating the history of the origin and geo- 

 graphical distribution of our mollusks ; and very interesting results are 

 already foreshadowed. 



I have received willing help from Dr. James Lewis, of Mohawk, New 

 York, in identifying the puzzling forms of the limneas and physas ; and 

 am glad to acknowledge his superior judgment, and thank him for his 

 kindly assistance. 



Jersey City, March, 1877. Ernest Ingersoll. 



CATALOGUE OF MOLLUSCA. 



Pulmonata Geophila. 



HELICID^. 



Limax castaneus, Ingersoll. 



Locality : Davidson's Ranch, Boulder County, Colorado ; Summit 

 Canon, Mt. Nebo, Utah. 



Described in Hayden's Annual Report, 1874, p. 396. Determined by 

 W. G. Binney. 



Vitrina limpida, Gould. 



Locality : Empire, Col. [Common among the beaver dams, August, 

 September, 1872.J 



Vitrina PfeilTeri, Newcomb. 

 Locality; Summit Canon, Mt. Nebo, Utah. [Common, August, 1875.] 



Microphysa Ingersolli, Bland. 



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

 mit Canon, Mt. Nebo, Utah. 



Type specimens from the Saguache Mountains of Southern Colorado. 



[Some notes regarding localities, etc., added by the collector, are distinguished by being 

 placed in brackets. — J. D. Putnam,] 



