MOILUSCASYSTEMA TIC REVIEW 



Fit;. I*. A, Helix pomatia ; B, Daudebardia (Helicophanta) brevipes : C, Testacella halio- 

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



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];. Peltella va.\liolum(BuUmnUd, after Ferussac). 



