of conchology. 215 



Reference to Plate. 



Fig. 1. Helix fidelis. Jaw. 



2. Orthalicus zebra. One central with its adjacent lat- 



eral, and one detached extreme lateral from the other 

 side of the membrane. 



3. Helix HempJiilli. Jaw. 



.4. Helix muscarujn. One central and one lateral tooth. 



5. Helicina orhiculata. The fifth lateral tooth. 



6. Achatina fasciata. One central and one lateral tooth. 



7. Helix tudiculatn. One central and one lateral tooth. 



8. Bulimulus suijlatus. Jaw. 



9. Helix fidelis. One central and one lateral tooth. 



10. Orthalicus undatus. One central and one lateral tooth. 



11. Helix redimita. Jaw. 



12. Orthalicus undatus. One extreme lateral tooth. 



13. Bulimulus sufflatus. One central and one lateral 



tooth. 



14. Helix orhiculata. Jaw. 



15. Succinea effusa. One central and one lateral tooth. 



16. Helix muscarum. Jaw. 



