612 



BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



JUDITH EIVEE GROUP. 



Valvata f montanaensis Meek. 



Viviparus conradi Meek and Hay- 

 den. 



Campelo7na vetula Meek and Hay- 

 den. 



Hydrobia subconica Meek. 



Goniohasis convexa Meek and Hay- 

 den. 



Goniohasis invenusta Meek and 

 Hay den. 



Goniobasis suhkevis Meek and Hay- 

 den. 



Goniohasis omitta Meek and Hay- 

 den. 



Goniobasis? gracilienta Meek and 

 Hayden. 



Goniobasis? subtortuosa Meek and 

 Hayden.* 



Selix vetusta Meek and Hayden. 



Hyalina? occidentalis Meek and 

 Hayden. 



Hyalina f evansi Meek and Hayden. 



Yitrina obliqua Meek and Hayden. 



FJiysa copei White. 



Bulinus atavus White. 



Bulinus subelongatus Meek and 

 Hayden. 



Flanorbis convolutus Meek. 



Flanorbis {BatJiyomijlialm) ami^lexus 

 Meek. 



Corbula pemndata Meek. 



Corbula mactriformis Meek and 

 Hayden. 



Corbicula subelliptica Meek and 

 Hayden. 



Corbicula moreauensis Meek and 

 Hayden. 



Corbicula nebrascensis Meek and 

 Hayden. 



Corbicula cytlieriformis Meek and 

 Hayden. 



Corbicula subtrifjonalis Meek aud 

 Hayden. 



Corbicula occidentalis Meek and 

 Hayden. 



Spluerium plamtm Meek and Hay- 

 den. 



Splicer iumf or mosum Meek and Hay- 

 den. 



Spluerium siibellipticum Meek and 

 Hayden. 



SpJuerium recticardinale Meek and 

 Hayden. 



Unio cryptorJiynchus White. 



ZTnio primcevns White. 



Unio dance Meek and Hayden. 



Unio deu-ieyanus Meek and Hayden. 



Unio subspatulatus Meek and Hay- 

 den. 



Unio prisons Meek and Hayden. 



Unio senectus White. 



Anodonta p>ropatoris White. 



Ostrea suMrigonalis Evans and 

 Shumard. 



Ostrea glabra Meek and Hayden. 



* Probably belongs to the genus Cassio^ella of White. 



