Shells of Gommon Occurrence. 143 



Of the Helices proper, we figure fifteen different 

 species ; they are mostly too well known to require to 

 be more than mentioned. Of these the largest and 

 most familiar, Helix aspersa, or common snail (Fig. 

 23), is the largest and most destructive in the 



26-27. 



3. Helix aspersa (the Common Snail), Mutter. 24-25. H. 

 revelata (the Green Snail), Ferussac. 26-27. H. nemoralis 

 (the Girdled Snail), Linnaeus. 



garden. Its usual diameter is an inch and a-half. 

 It is olive coloured, with dark brown bands. The 

 shell is in reality not slimy, though apparently rough 

 on the surface. It is alleged that barrels are ex- 

 ported as a dainty to America, and that the London 

 markets are largely supplied with it as a remedy 

 for pulmonary complaints. In the United States 

 it has been successfully acclimatized, and is now 



