1917.] NATURAL SCIENCES OF PHILADELPHIA. 51 



or confirmed the identifications of the Physas and Lymnaeas, as well 

 as some of the other fresh-water snails. Dr. H. A. Pilsbry has 

 determined many of the smaller and more difficult land snails and 

 has examined both shells and soft anatomy of the Oreohelices. The 

 Physas and Sphferiidse of the region are not well understood and 

 difficult at the best. Hence many of the determinations must be 

 considered tentative. In a number of instances, also, the material 

 is in poor condition for determination. 



Rupert, Idaho. 



The following species in the University of Colorado Museum were 

 collected by Mr. Fayre Kenegy, along the Snake River, near Rupert, 

 in 1913: 



Pisidium sp. Lymncea near traskii Tryon. 



Sphcerium sp. Physa sp. 



A nodonta nuttaUiana Lea. A ncyliis crassus Hald. 

 Fluminicola fusca (Hald.). 



The Sphcerium is apparently the same puzzling species as that 

 from Sta. 74, near Ovid, Idaho. 



Idaho Falls, Idaho. 



The following species were collected by Daniels, in and on the 

 banks of Snake River, Idaho Falls, in August, 1915: 



Sphoeriumnesir aureum Prime. Lymncea humilis modicella Say. 



Pisidium compressum Prime, var. Lymncea humilis rustica Lea. 



Zonitoides nitida (Miill.). Lymncea apicina solida Lea. 



Succinea haydeni W. G. B. Planorhis parvus Say. 



Succinea oregonensis gahbii Try- Physa near gyrina Say. 



on? Physa ampullacea Gld. 

 Fluminicola fusca (Hald.). 



The Lymnseas and Physas were identified by Walker. . We record 

 Physa ampidlacea from a number of stations, all the material having 

 been identified or identifications confirmed by Walker. Gould' 

 described this form from Oregon, under the name P. bullata, in 1855. 

 In 1865 Binney^ republished the description, figured the species, 

 and, at Gould's suggestion, renamed it atnpullacea, the name bullata 

 being preoccupied. He recorded it also from Washington. Mean- 



3 Proc. Boston Soc. Nat. Hisl., V, p. 128, 1855. 



* Land and Fresh Water Shells of North America, Part II, p. 79, figs. 133, 134, 

 135, 1865. 



