VII 



MOLL USC A S YSTEMA TIC RE I 'IE W 



D 



FIG. 12. .4, Helix pomatia ; /;, Daudebardia (Helicophanta) brevipes ; r, Testacella halio- 

 tidea; />, Arion ater ; x, shell, in D sliielil (from Lankester). 



FIG. 13. Peltella palliolum (BuU m/ilkl, aftei- Ferussac). 



