NATURAL SCIENCES OF PHILADELPHIA. 241 



Fig. 6. Helix Ayresiana, Newc. 

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

 Fig. 8. Helix Nickliniana, Lea. 

 Fig. 9. Helix raraentosa, Gld. 



8. The eighth tooth an outer lateral. 

 Fig. 10. Helix exarata, Pfr. 



Plate XV. 



a. Central and lateral teeth. 



b. Inner marginal tooth. 



c. Outer marginal tooth. 

 Fisr. 1. Macroceramus Gossei, Pfr. 

 Fig. 2. Pupa rupicola, Say. 



Fig. 3. Succinea avara, Say. 



Fig. 4. Succinea obliqua, Say. 



Fig. 5. Stenogyra decollata, Lin. 



Fig. 6. Succinea effusa, Shuttl. 



Fig. T. Bulimulus 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 XVI. 



Jaw of: 



Stenogyra subula, Pfr. 



Arion hortensis, Fe*r. 



Vitrina limpida, Gld. 



Helix Newberryana, W. G. B. 

 5. Ferussacia subcylindrica, L. 



Hemphillia glandulosa, Bl. and Binn. 



Pupa rupicola, Say. 



Helix aspersa, Mull. 



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. 



