4 University of Michigan 



7. Cuervo River, San Miguel Co., N. AL 

 Land species identified by Clapp. 



Zoiiitoidcs miiiuscula (Binn.). 



Zonitoides singleyana Pils. 



Helicodiscns parallclus (Say). 



I'allonia costata (Mull). 



Ptipoides niarginata (Say). 



PupiUa sonorana (St.). 



Bifidaria hordeacella Pils. 



Bifidaria cristata P. & V. 



Bifidaria procera (Gld.). 



Bifidaria Iiolcingeri St. 



Planorbis lentiis Say var. ? 



Segmentina obstruct a (Mor.)? A few very young ex- 

 amples are probably this species. 



Planorbis parvus Say. 



Pliysa sp. ? A. single, immature example, too young to 

 be sure about, but different from young forshevi 

 of the same size. 



8. Fourteen miles northeast of Tucumcari, N. M. 

 Identified, except the Siicciuea, by Clapp. 

 Zonitoides niinuscula (Binn.). 

 Zonitoides singleyana Pils. 

 Helicodiscns parallclus (Say). 

 Vallonia costata (Miill.). 

 Pupoides marginata (Say). 

 Pupoidcs liordacea (Gabb). 

 Papilla sonorana (St.). 

 Bifidaria hordeacella Pils. 

 Bifidaria procera (Gld.). 

 Bifidaria cristata P. & V. 

 Succinea grosvernori Lea? Very young. 



