614 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



differ materially from those of any of the formations that have hitherto 

 been studied : — 



FEOM SNAKE RIVER VALLEY, SOUTHWESTERN IDAHO. 



Melania taylori Gabb. | Lithasia antiqua Gabb. 



FROM CACHE VALLEY, UTAH. 



Linncea (FolyrJiytis) Mngi Meek. 



FROM FOSSIL HILL, KAHSOW MOUNTAINS, NEVADA. 



Melania f sculptilis Meek. 

 Melania f subsculptilis Meek. 

 Carinifex ( Vorticifex) tryoni Meek. 

 Carinifex {Vorticifex) binneyi Meek. 



Ancylus undulatus Meek. 

 SpJiceriumf rugosum Meek. 

 SpluBriumf idahoense Meek. 



FROM CROW CREEK, NORTHERN COLORADO. 



Melania lanmda White. 



