Occasional Papers of the Museum of Zoology 7 



Strobilops labyriiithica texasiana P. & F. 

 Bifidaria contracta (Say). 

 Bifidaria cristata P. & V. 

 Bifidaria hordcacella Pils. 



15. North Fork of the Little Wichita River, south of Dundee, 



Texas. 

 Land species, except Succinea, identified by Glapp. 

 Polygyra texasiana (Moric.). 

 Zonitoides niinuscula (Rinn.). 

 Zonitoides slngleyana Pils. 

 Zonitoides niimmns \"an. 

 Punctum pyginccuni (Dr.). 

 Vallonia costata (Mull.). 

 Pupoides niarginata (Say). 

 Bifidaria proccra (Glcl). 

 Bifidaria tappaniana (C. B. Ads.). 

 Bifidaria cristata P. & V. 

 Bifidaria hordeaccUa Pils. 

 Succinea grosvernori Lea. 

 Lymncea bulimoides tcchclla Hald. 

 Physa forsheyi Lea. 

 Planorbis lentns Say var. ? 

 Segmentina obstructa (Alor). 



16. Red River or Prairie Dog Fork, Silverton-Clarendon 



Road, Texas. 

 Identified by Clapp. 



Zonitoides niinuscula (Binn.). 

 Zonitoides singlcyana Pils. 

 Pupoides marginata (Say). 

 Bifidaria cristata P. & V. 

 Bifidaria hordcacella Pils. 



