TABLE OF DISTRIBUTION. 



319 



Species. 



Terrestrial (continued). 



Univalves. 



Pupa ringens , 



umbilicata 



marginata 



Vertigo antivertigo 



Moulinsiana 



pygmaea 



alpestris 



substriata 



pusilla 



angustior 



edentula 



ininutissima 



Balia perversa 



Clausilia rugosa 



E-olphii 



biplicata 



laminata 



Cochlicopa tridens 



lubrica 



Achatina acicula 



Carychium minimum 



Cyclostoma elegans 



Acme lineata 



Number of terrestrial 



species 74 



Total number of 



species 121 



N.B. Doubtful cases are 

 not reckoned. 



u 

 o 



113 



e 



X! 



O 



115 





80 



Distribution in other parts of 

 the world. 



Siberia. 



Siberia. 



N. America? 



Siberia. 



Smyrna. 



Asia, Africa, and America. 



Siberia. 



Siberia. 



Besides the species enumerated in the above list, four 

 more occur in our upper tertiary strata, but are not now 

 found living in this country. One of them [Hydrobia 

 marginata] is aquatic and inhabits the South of Europe. 

 The other three (viz. Helix fruticum, H. incarnata, and 

 H. ruderata) are terrestrial and inhabit both the North 

 and South of Europe. H. fruticu7n and H. ruderata are 

 also Siberian species. 



It will be seen that, with only two exceptions (viz. 



