THE NAUTILUS. 43 



LampsiUs ventricosa (Barnes) 



Lymiura ohrussa Say 



Lymncra humilis modicella Say? (two specimens) 



Oreohelix cooperi (W. G. B.) 



Pyramidul-a cronkhitei anthowji I'ils. 



Succinea avara Say 



Vallonia gracilicosta Reinh, 



Zoniioides arborea (Say) 



Physa gyrina Say 



Physa Integra Ilald.? 



Planorhvi parvus Say 



Only a single broken example of the Oreohelix was found, 

 in the river bottom, and it may have been brought by the 

 stream from far away in the spring flootl. 



Sta. 236, creek bottom about ten or twelve miles north of 

 Uva, under willows and cottonwoods. 



Vallonia gracilicosta Reinh. 

 Vitrina alaskana Dall. 

 Zo7iitoides arborea (Say) 



Sta. 237, five miles northwest of Douglas, in a small spring 

 brook. 



Lymn<ea obrussa Say 

 Physa gyrina Say 

 Plaiwrbis parvus Say 



Sta. 238, Boxelder Creek, about 18 or 20 miles northwest 

 of Douglas. 



Ferrissui rivularis Say 



Lymn<pa obrussa Saj'' 



Physa gyrina Say 



Planorbis parvus Say 



Pyramidula cronkhitei anthnmji Pils. 



Succinea avara Say 



'Valloni<i gracilicosta Reinh. 



Vitrina alaskana Dall 



Zonitoides arborea (Say) 



Sta. 239, a very small reservoir formed by tlirowing an 

 earth dam acro-ss a dry draw to catch the st/)rm waters for 

 stock, four miles west of Arminta. A few very rotten shells 

 of Lymncra bulimoides cockereUi Pils. & Fer. were found. 



