42 THE NAUTILUS. 



Agriolirtmx campestris (Binn.) 



Ferrissia rivularis Say 



Lampsilis ventricosa (Barnes) 



Lymna-a bulimoides cockerelli Pils. & Ferr 



Lymncra caperata Say 



Lymncra humilis modicella Say? 



LymiKca obrussa Say 



Physa anatina Lea 



Physa gyrina Say 



Physa Integra Hald. ? 



Physa sayi warreniana Lea? 



Physa walkeri Grand. 



Planorbis parvus Say 



Vattoma gracilicosta Reinh. 



Zonitoides arborea (Say) 



In a recent paper Daniels and I asserted the probable oc- 

 currence of L. b. cockerelli in Wyoming, which is now con- 

 firmed. 



Following is an account of the stations visited and the mol- 

 lusks obtained at each : 



Sta. 232, reservoir where the road from Cheyenne to Cas- 

 per crosses Lodgepole Creek, about thirteen miles north of 

 Cheyenne. 



Pisidium sp. 



Agriolimax campestris (Binn.) 



Lymncea obru-ssa Say 



Physa- saijii warreniana Lea? 



Planorbis parvus Say 



Succinea avara Say 



Vallo-nia gracilicosta Reiuh. 



Sta. 233, a branch of Bear Creek, north of Horse Creek. 

 Pisidium sp. 

 Lymncra. obrussa Say 

 Physa walkeri Grand. 



Sta. 234, small reservoir six miles northeast of Wheatland. 



Lymnfca caperata Say 

 Physa gyrina Say 

 Planorbis parvus Say 



Sta. 235, bridge over Laramie river, below Uva. 



