8 University of Michigan . 



17. Piedroso Creek, north of Amarillo, Texas. "Loess"? 



Case. 



Succinea grosvernori Lea. 



Lymncoa caperafa Say? A single, badly broken speci- 

 men may be this species. 



Physa gyrina Say. 



Physa forsJievi Lea? A single, decollate, very much 

 distorted specimen may be this species. 



Planorbis lentus Say var. ? 



Sphtrrium anreum Pme. 



S phce Hum sp.? '"'One valve, more like striatinnm, but?'' 



Sph<rriuni sp.? "One valve distinct."' 



Sphccriuni sp.'l "This deposit must have other good 

 things, but it does not appear to be "seohan loess." 

 fSterki). 



18. Orland, Oklahoma, 

 Identified by Clapp. 



Bifidaria cristata P. & V. 

 Bifidaria proccra (Gld.). 



19. Beaver Creek, Riverside, Beaver Co., Oklahoma. 

 Identified by Clapp. 



Zonitoides nnuimus A'an. 

 Pupoides marginatn (Say). 

 Bifidaria cristata P. & Y. 

 Bifidaria proccra (Gld.). 



20. Cimmaron River, Ripley, Oklahoma. 

 Identified by Clapp. 



Polygyra texasiana (Moric). 

 Polygyra monodon alicice Pils. 

 Zonitoides minusciila (Binn.). 

 Zonitoides singleyana Pils. 

 Vitrea indentata (Sav). 



