320 TABLE OF DISTRIBUTION. 



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

 H. ruderata) are terrestrial and inhabit both the North 

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

 also Siberian species. 



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

 Zonites alliarius and Pupa ringens), all the species which 

 occur in our upper tertiaries are northern forms, and 

 that very few are exclusively northern or southern. 



In the body of this work the term "North of Europe " 

 has been used in the ordinary sense, and not with refer- 

 ence to the somewhat arbitrary line of demarcation 

 proposed in the foregoing Table. The authority can be 

 given for every locality ; but to have done this would 

 have taken a great deal of extra space and unnecessarily 

 encumbered the work. 



