134 



Succinea ovalis, Gould. 

 Camp ]0 : Mouth of Blue River 1 specimen. 



Succinea rusticana, Gould. 



Camp 9 : Hot Sulphur Springs 12 specimens. 



Sum ass Prairie, Eraser Eiver {Lord) ; Rocky Mountains of Bitter 

 Root Valley, 2,500 to 4,500 feet [Cooper] ; White Pine region, Nevada 

 {HempMll). 



Remarks. — These three species are hardly to be distinguished, 

 separated them as above after examination of shells in the Museum ot 

 Comparative Zoology, but they merge into one another indeterminately. 



Succinea RawJcinsiij Baird. — East of Fort Colville, Washington Terri- 

 tory {N. W. Bound. Survey) ; Lake Osoyoos (Lord). 



Succinea SilUmani, Bland. — Humboldt Lake, Nevada {Silliman). 



Succinea lineata, W. G. Binney. 



Camp 20 : 20 miles west of Saguache 8 specimens. 



Camp D : Animas Valley 50 specimens. 



Lakes San Luis Valley 10 specimens. 



IS'ortheast California to Nebraska and British Columbia (Cooper) ; 

 Utah, Yellowstone River [Smitlisonian Catalogue)] Little Colorado, Ari- 

 zona {Palmer) ; Estes Park, Colorado {Carpenter). 



Remarks. — I should not quarrel with any one who should i)ronounce 

 some of the smaller of my specimens to be S. Stretchiana, Bid. Yet 

 upon comparison with shells in the Museum of Comparative Zoology, I 

 IDreferto call them all by the above name. They include but four living 

 snails among the whole number, the rest being dead shells. 



Succinea Stretchiana, Bland. — Little Valley, Washoe County, Nevada 



{Stretch). 



Remarks. — If, as is indicated by the map appended to Mr. Binney's 

 catalogue (Bull. M. C. Z., Ill, ix), the Central Province includes the 

 valley of the Yellowstone as far east as its mouth, Succinea Haydoii, 

 W. G. Binn., and S. retusa, Lea, must be considered to belong to our list. 

 and several localities on the Yellowstone River can be added to the 

 distribution of S. lineata, as well as to that of quite a number of shells 

 in other families. 



PHYSIDiE. 



Physa heterostropha, Say. 



Camp 9 : Hot Sulphur Springs 100 specimens. 



Camp 18 : Springs east of Saguache 40 specimens. 



Between the Animas and La Plata 5 specimens. 



Its range from the Atlantic to the Pacific is well assured, it having 

 been collected in nearly every State and Territory. 



Remarks. — My specimens show the greatest variation in point of 

 size, shape, and color; yet, in the absence of other types, all seem refer- 

 able to this'species. The Grand River, which flows through Middle Park, 

 contains no Fhysce (or other mollusks) that I could discover; but at the 



