270 INDEX TO GENERA. 



Numrnulina, 168, 199. Sphincterochila, 262. 

 Ophiogyra==Polygyratia, 111. Stenostoma=Stenotrema, 112. 



Pararhytida, 18, 95. Stenotrema, 112, 139. 



Paryphanta, 261, 265. Stephanoda=Amphidoxa, 16, 47. 



Patera=Mesodon, 113. Strobila, 112, 138. 



Patula, 15, 19, 266. Systrophia=Polygyratia, 111, 



Patulastra=Punctum, 15. Tetrodontina=Metodontia, 149. 



Pelia, 19, 102. Theba, 168. 



Pella, 19, 103, 267. Thera=Thysanota, 18, 95. 



Petasia, 167, 170. Thysanophora, 16, 50. 



Phasis^Pella, 19. Thysanota, 18, 93. 

 Phryxgnathus=Punctuni, 15, 37. Trichia, 167, 172, 268. 



Pitys Endodonta, 17. Trichodiscus, 16, 49. 



Planogyra, 15, 28. Trigonostoma, 110, 115, 267. 



Plectopylis, 114, 159. Triodopsis, 112, 143. 



Poecilozonites, 19, 95, 267. Trochiscus, 167, 171. 



Polygyra, 111, 124, 128. Trochomorpha, 18, 72, 267. 



Polygyratia, 111, 124, 268. Trochomorphoides=Trochoinor- 



Polygyrella, 111, 129. pha, 18. 



Pristina=Anceyia, 102. Ulostoma, 113, 155. 



Punctuin, 15, 28, 263. Vallonia, 166, 169. 



Pyramidula, 16, 51. Videna, 18, 82, 264, 267. 



Rhyssota, 261, 264. Vortex==Trigonostoma, 111. 



Sagda, 5. Xerophila, 168, 223. 



Satsuma, 168, 217. Xolotrema, 113, 147. 



Sculptaria, 112, 138. Zenobia, 167, 186. 



Sheldonia, 267, Zoogenites=Acauthinula, 17, 54. 

 Spelseodiscus Punctum, 30. 



