60 PROCEEDINGS OF THE ACADEMY OF [Feb.^ 



MargarUana'margaritifera'L.? Fluminicola fusca (Hald.)- 



Sphcerium sp. Lymncea traskii Tryon. 



Succinea grosvenori Lea ? 



Sta. 98, bottomland near Sta. 97. Oreohelix cooperi (W. G. B.) 

 abundant under leaves in clumps of rose bushes, scrub willows, etc. 

 This station, a flat soil area entirely free from rocks and some distance 

 from ledges, is an unusual site for a fine colony of Oreohelix. The 

 same species is common under similar conditions at Montrose, 

 Colorado. 



Sta. 99, slough west of Sta. 98, north of wagon road. Lymncea 

 traskii Lea (?), dead shells abundant, fairly fresh; live examples not 

 found. Physa ampullacea Gould, one dead shell. A similar slough 

 across the road yielded no mollusks at all. 



Sta. 100, muddy bank of river due north of Sta. 99. Succinea 

 avara Say common under overhanging willows. 



Weston, Idaho. 



Sta. 59, cliff of igneous rock about three miles northwest of Weston. 

 Though the place from a distance looked like good snail territory, 

 we succeeded in finding only a very few scorched shells which seem 

 to be a small form of Oreohelix strigosa depressa (Ckll.). A j^ear or 

 two before, a fierce fire had swept the mountain, burning the leaves 

 and sticks to the very bottom of the rock slides, but the scarcity of 

 ''bones" shows that the snails were not at all plentiful before the 

 fire. We also visited a good-looking mountain southwest of Weston, 

 in the northern edge of Utah, but found no snails there. 



Sta. 60, irrigating ditch southeast of Sta. 59, about one-third of 

 the way to town: 



Succinea oregonensis Lea. Lymncea hulimoides cockerelli Pils. 



Lymncea humilis modicella Say. and Ferr. 



Physa crandalli Baker ? 



So far as we know, this is the only record of L. h. cockerelli 

 for Idaho, though the Montana, Colorado, New Mexico and 

 Nevada records would lead one to expect it in Idaho, Utah and 

 Wyoming. 



Sta. 61, stagnant roadside pool southeast of Sta. 60, about a mile 

 northwest of Weston. Lymncea traskii Tryon (typical, according to 

 Walker), common, young very abundant. 



In 1915 Daniels obtained from the banks of the Bear River, east 

 of Weston, Succinea haydeni W. G. B. and Lymncea proxima Lea. 



