PALAEONTOLOGY 



a, 



FIG. 35. GASTROPODS. 



(X|. 



Neplunea contraria (Linne'), Pliocene. 

 b, Clavella longceva (Lamark), Eocene. ( 

 A.C., Anterior canal; P.C., posterior canal, 



(After Harmer. \ 

 (After Deshayes.) 

 c, Volutilithes athleta 



