NATURAL SCIENCES OP PHILADELPHIA. 241 



Fig. 6. Helix Ayi'esiana, Newc. 

 Fig. 1. Helix redimita, W. G. B. 

 Fig. 8. Helix Nickliniana, Lea. 

 Fig. 9. Helix raraentosa, Gld. 



8. The eighth tooth — an outei* lateral. 

 Fig. 10. Helix exarata, Pfr. 



Plate XY. 



a. Central and lateral teeth. 



6. Inner marginal tooth. 



c. Outer marginal tooth. 

 Fig. 1. Macroceramus Gossei, Pfr. 

 Fig. 2. Pupa rupicola, Say. 

 Fig. 3. Succinea avara, Say. 

 Fig. 4. Succinea obliqua, Sny. 

 Fig. 5. Stenogyra decollata, Lin. 

 Fig. 6. Succinea effusa, Shuttl. 

 Fig. T. Buliraulus dealbatus, Say. 

 Fig. 8. Stenogyra subula, Pfr. 

 Fig. 9. Coecilianella subcylindrica, Lin. 

 Fig. 10. Succinea campestris, Say. 

 Fig. 11. Succinea lineata, W. G. B. 

 Fig. 12. Pupa fallax, Say. 



Plate XYI. 



Jaw of: — 

 Fig. 1. Stenogyra subula, Pfr. 

 Fig. 2. Arion hortensis, Fer. 

 Fig. 3. Vitrina limpida, Gld. 

 Fig. 4. Helix Newberryana, W. G. B. 

 Fig. 5. Ferussacia subcylindrica, L. 

 Fig. 6. Hemphillia glandulosa, Bl. and Binn. 

 Fig. t. Pupa rupicola, Say. 

 Fig. 8. Helix aspersa, Miill. 

 Fig. 9. Prophysaon Hemphilli, Bl. and Binn. 

 Fig. 10. Helix Yatesi, J. G. Cooper. ^ 



Fig. 11. Helix polygyrella, Bl. and J. G. Coop. 

 Fig. 12. Bulimulus sufflatus, Gld. 

 Fig. 13. Orthalicus undatus, Brug. 

 Fig. 14. Helix griseola, Pfr. 



