238 PROCEEDINGS OF THE ACADEMY OF 



Fig. 5. Patula alternata, Say. 



Fig. 6. Patula Hemphilli, Newc. 



Fig. 7. Patula alternata, Say. Yar. mordax, ShuttL 



Fig. 8. Patula Cuinberlandiana, Lea. 



Fig. 9. Patula solitaria, Say. 



Fig. 10. Patula striatella, Anthony. 



Plate VIII. 



a. Central and lateral teeth. 

 h. The last lateral tooth. 



c. Inner marginal teeth. 



d. Outer marginal teeth. 

 Helix Texasiana, Mor. 

 Helix Troostiana, Lea. 



3. Helix uvulifera, Shuttl. 



Helix espiloca, Rav. 



Helix Hazardi, Bl. 



Helix septemvolva, Say. 



Helix Febigeri, Bl. 



Helix pustula, Fer. 



Helix auriformis, Bl. 



Helix Mooreana, W. G. B. 

 Fig. 11. Helix fastigans, L. W. Say. 

 Fig. 12. Helix auriculata, Say. 



Plate IX. 

 Fig. L Helix Edvardsi, Bland. 



a. Central and first lateral. 



h. Marginal. 



c. Extreme marginal. 

 Fig. 2. Helix polygyrella, Bland. Same references. 

 Fig. 3. Helix Yatesi, J. G. Coop. Same references. 

 Fig. 4. Helix monodon, Rack. Same references. 

 Fig. 5. Helix germana, Gld. Same references. 

 Fig. 6. Helix hirsuta, Say. 



h. Transition from laterals to marginals. 

 Fig. 7. Helix stenotrema, Fer. 



a. Central and lateral teeth. 



6. Extreme marginals. 

 Fig. 8. Helix spinosa, Lea. 

 Fig. 9. Helix barbigera, Redf. References as in fig. 6. 



