400 GEOLOGICAL SURVEY OF THE TERRITORIES. 



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

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



ISiiccinca Sillimani, Bland.— Humboldt Lake, Nevada (Silliman). Pa- 

 cific slope. 



•Succinea lineata, W. G. Binney. 



Camp 20 : 20 miles west of Saguache = 8 specimens. 



Camp J) : Animas Valley 50 specimens. 



La kes, San Luis Valley 10 specimens. 



Bank of Bear River (Barber) . . 1 specimen. 



Northeast California to Nebraska and British Columbia (Cooper) ; 

 Utah, Yellowstone River (Smithsonian Catalogue) ; Little Colorado, Ari- 

 zona (Palmer) ; Este's Park, Colorado (Carpenter). 



I should not quarrel with any one who should pronounce some of the 

 smaller of my specimens to be S. Stretchiana, Bid. Yet, upon compari- 

 son with sheils in the Museum of Comparative Zoology, I prefer to call 

 their- all by the above name. They include but four living snails among 

 the whole number, the rest being dead shells. Mr. Barber's example is 

 a fine one. 



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

 (Stretch). Pacific slope. 



Succinea avara, White Pine, Nevada (Binney). Eastern North Amer- 

 ica. 



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 Haydeni, 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 several mollusks in other families. 



PHYSID^. 



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. These specimens 

 show the greatest variation in point of size, shape, and color ; yet, in the 

 absence of other types, all seem referable to this species. The Grand 

 River, which flows through Middle Park, contains no Physw (or other 

 mollusks) that I could discover ; but at the Hot Springs, in a little la- 

 goon filled at high water, large, clear, ampullacea like shells were com- 

 mon. In the few yards of exposed outlet of the springs of hot sulphur- 

 water from which the locality derives its name and celebrity, there oc- 

 curred in the greatest profusion a blackish globose variety about one- 

 fifth of an inch long. The temperature of this water was at some points 

 as high as 100° F. In the basin of a still hotter spring close by, whose 

 waters were saturated with chlorides of sodium and magnesium, hun- 

 dreds of still smaller Physw (see below) were floating about in mats, 

 glued together by a tangle of confervoid vegetation and the depositions 

 of the water. All of these seemed to have lost the apex of the spire by 



