VII 



MOLL USC A SYSTEMATIC REVIEW 



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

 tidea; D, Arion ater ; s, shell, in D shield (from Lankester). 



FIG. 13. Peltella paMiolum(Bulimulid, after Ferussac). 



