Doubtful and Spurious Species. 



Physa ampullarm, Lea. 

 Physa rivalis, Mich. 

 Physa planorhtda, De Kay. 

 Physa fontinalis, Sheppard. 

 Physa subopaca, Sheppard! 



Physa scalaris, Jay, Ilald., 

 not Dunker. 

 (Paludina scalaris, Jay.) 

 Physa marginata, Bell, 



Whiteaves. 



Fossil Species. 



Physa secalina, Evans and 



Sluiniard. 

 Physa {Aplpxa') rhomhoi- 



dea, Meek and Ildn. 



Physa (Aplexa) suhelonga- 

 ta, Meek and Hayden. 



Genus Plaiiorljis. 



§1. 

 Planorbis newberryi, Lea. 



§2. 



Planorbis campanulatus, Smj, 

 Hald., Gould, C. B. Ad., De 

 Kay, Kiist. 

 Planorbis hellus, Lea. 

 Planorbis bicarinatus, Sowb. 



Planorbella cnmpannlatn, Clienu. 



Planorbis multivolvis, Case 

 Adida multivolvis, H. Adams. 



Planorbis haldemani, Dunker, in 

 KUst., not C. B. Ad. 



§3. 



Planorbis wheatleyi, Lea. 

 Planorbis armigerus, Say, Iluld., 



GUI., C. B. Ad., Dek., M. E. 



Gray, 



Ser/meiitina armirjera, H. and A. 



Ad. 

 Planorbella armigera, Chenu. 



§4. 



Planorbis opercularis, Gld. 

 Planorbis planulatus, Cooper. 



Planorbis exacutus, Saji, Hald., 

 G-d., C. B. Ad., Da K. 



Planorbis lens. Lea. 

 Planorbis brofjniarti. Lea. ' 

 Planorbis lenticularis, Lea, 

 Planorbis buchanensis, Lea. 

 Paludina liyalina, Lea. 



