THE NAUTILUS. 123 



Lymnaea palustris nuttalliana Lea. Occurring with the preceding 

 in Bear Lake and intergrading with it, this form is also abundant in 

 Bluff Lake Creek and the swamp at its head. The specimens from 

 these localities are very distinct and uniform, and several hundred 

 examples showed no tendency to grade into typical palustris. All 

 the specimens found here are very much larger and less fragile than 

 those from Bear Lake. 



Physa cooperi Tryon. Common in Bear Lake, and a smaller 

 form was found in myriads in a watering trough on the City Creek 

 Canon Road. (Alt. about 2000 ft.) 



Physa sp. May be a variety of the preceding with which it 

 occurs in Bear Lake, but it has a much more ventricose body-whorl. 



Physa politissima Tryon. Bear Lake — common. A fine, large 

 species. 



Planorbis trivolvis Say. Bear Lake ; Bluff Lake Creek ; swamp 

 at Bluff Lake. Very common, but specimens generally much eroded. 



Planorbis parvus Say. Swamp at Bluff Lake. Specimens identi- 

 fied by Dr. Pilsbry. 



Planorbis vermicularis Gould. Not uncommon in Bear Lake. 

 Specimens identified by Dr. Dall. It seems to me that this species 

 is hardly more than a mere form of the preceding, although the 

 specimens from Bear Lake have a more rounded and less flattened 

 body-whorl, and are quite readily separated from those found in the 

 swamp. 



Vitrina alaskana Dall. Two specimens under sticks in the 

 meadow at Bluff Lake. 



Zonitoides arborea Say. About a dozen specimens found about 

 an old stump in the border of the woods at Bluff Lake. 



Euconulus Julvus Draparnaud. Bluff Lake ; two specimens under 

 logs at the edge of the meadow. This species has already been re- 

 ported from " San Bernardino County " by Binney. 



Vertigo occidentalis Sterki. One specimen (the type, No. 1860 

 of my collection) was found near a spring in the caiion side below 

 Bluff Lake Swamp. Diligent search on two occasions produced not 

 another specimen, but this was enough for Dr. Sterki to pronounce 

 as " evidently of an unknown species." It is described in Nautilus 

 XXI, p. 90, q. v. 



Epiphragmophora tudiculata W. G. Binney. At the base of the 

 mountains near Highland (1904); near Mentone (1900); also re- 

 ported from above San Bernardino. 



