THE NAUTILUS. 91 



Vallonia parvula Sterki. Clay, Deuel and Brule Counties. 

 Vallonia gracilicosta Reinh. Common over the State. 

 Vallonia perspectiva Sterki. Deuel Co. 



Oreohelix cooperi W. G. B. Spearfii?h Canyon, Lawrence Co. 



Polygyra monodon Rack. Woods along Vermilion River, Clay 

 Co. 



Pupoides marginatus Say. Common in the semi-arid districts. 

 Also Clay Co. 



Pupoides wornatus Vaiiatta. Type lot from drift along White 

 River, Washington Co. Also collected along Indian Creek, 

 eastern Pennington Co. 



Bifidaria tappaninna Ads. Clay and Deuel Counties. 



Bifidaria clappi Sterki. Pennington Co. 



Bifidaria holzingeri Sterki. One specimen taken in woods 

 along Spearfish Creek in Lawrence Co. 



Bifidaria agna Pils. and Van. Quite general over the State. 



Bifidaria contracta Say. Clay Co. 



Bifidaria procera Gld. All through the southern part of State. 



Bifidaria arv\ijera Say. Common over the State. 



Bifidaria amiifera abbreviata Sterki. Perkins Co. 



Bifidaria pentodon Say. Over the State. 



Pupilla muscorum L. Washington Co. 



Pupilla blandi Morse. Pennington and Brule Counties. 



Vertigo ovata Say. Deuel and Clay Counties. Probably 

 common in eastern part of State. 



Vertigo milium Gld. Found in drift along Missouri River at 

 Chamberlain, Brule Co. 



Cochlicopa liibrica Miill. Clay, Lawrence and Deuel Counties. 



Vitrina alaskana Dall. Lawrence Co. 



Polita hammonis Strom. Clay, Deuel and Pennington Coun- 

 ties. 



Euconulus fulvus MUll. Pennington, Lawrence, Harding and 

 Deuel Counties. 



Zonitoides arborea Say. Locally over the State. 



Zonitoides minusada Binn. Common over the State. 



Zonitoides nitida Miill. Clay, Deuel and Washabaugh Counties. 



Zonitoides singleyana, Pils. Brule, Clay and Custer Counties. 



Agriolimax campestns Binn. Harding Co. Probably in eastern 

 part of State. 



