2 University of Michigan 



the Snccineas, and to Dr. Sterki for the determination of the 

 Sphasriid.'e. The fresh-water species, with the exception of the 

 Sphseriid^s, and the Snccineas were identified by the writer. 



1. Fort Defiance, Arizona. "Post-pleistocene," Case. 



Zonitoides arbor ea (Say). 



Zonitoidcs siiigleyana Pils. 



Siiccinea avara Say. 



LymiKxa proxima Lea. 



Lymncea humilis rustica Lea? Two specimens in very 



poor condition seem to he this. 

 Planorbis Deflectus Say. 

 Planorbis parvus Say. 



2. Fort Defiance, Arizona. "Drift," Case. 

 Identified by Clapp. 



Zonitoides ininnsc Ilia (Binn.). 

 Zonitoides singleyana Pils. 

 Vallonia cyclophorella Ancey. 

 Pnpoides marginata (Say). 

 Pnpoides hordacea (Gabb). 

 Bifidaria hordeacella Pils. 

 BiHdaria procera (Gld.). 



2. Canones Creek, east of Mt. Pedernal, Rio Arribo Co , 



N. M. 



Identified by Sterki. 



Pnpoides hordacea (Gabb), 

 Pupilla hlandi (Mse.). 

 Bifidaria pilsbryana St. 

 Vallonia gracilicosta Reinh. 

 J^allonia cyclophorella Ancey. 

 Vallonia perspectiva St. 

 Helicodiscus parallelus (Say). 



