EXPLANATION OB^ PLATES. 

 Plate 1. 



Fig. 1. PlanorUs tampaensis Dall, lat. 12.5 mm., p. 30. 



2. BuUmuIus tortilla Dall, alt. 8 mm., p. 27. 



3. BuUmulus tampw Dall, alt. 13.7 mm., p. 26. 



4. Urocoptis fJoridana Dall, alt. 8 mm., p. 30. 



5. BuUmulus balHstae Dall, alt. 10.7 mm., p. 26. 



6. Pupoides pilshryi Dall, alt. 4 mm., p. 29. 



7. Amnicola adesta Dall, alt. 3.2 mm., p. 102. 



8. Planorbis elisus Dall, basal view, diam. 4 mm., p. 31. 



9. The same specimen in profile. 



10. Fissurella ceryx Dall, profile, Ion. 9.5 mm., p. 115. 



11. The same from above. 



12. Pleurodonte haruspica Dall, upper surface, lat. 26 mm., p. 23. 



13. The same in profile. 



14. The same, basal surface, lat. 26 mm. 



15. Cerion anodonta Dall, alt. 26.5 mm., p. 28. 



16. Microccrion floridanum Dall, alt. 4.75 mm., p. 29. 



17. The same in profile, showing the form of the reflected lip, lat. of shell 



2.4 mm. 



18. BuUmulus remoUna Dall, alt. 9.2 mm., p. 27. 



Plate 2. 



Fig. 1. BuUmulus heilprinianus Dall, alt. 11 mm., p. 25. 

 2. BuUmulus floridanus Conrad, alt. 10 mm., p. 25. 

 ■ 3. Urocoptis floridana Dall, alt. 11.5 mm., p. 30. 



4. BuUmulus steamsii Dall, alt. 13 mm., p. 27. 



5. BuUmulus americanus Heilprin, alt. 17 mm., p. 26. 



6. Cepolis instrumosa Dall, lat. 13.5 mm., p. 23. 



7. Polygyra adammis Dall, upper surface, lat. 9.1 mm., p. 24. 



8. Cepolis crusta Dall, lat. 15 mhi., p. 24. 



9. Polygyra adamnis Dall, front view, p. 24. 



10. Body whorl of BuUmulus heilprinianus enlarged to show form of sub- 



sutural sinus and lip, p. 25. 



11. Pleurodonte haruspica Dall, lat. 24 mm., p. 23. 



12. Cepolis direpta Dall, front view, lat. 15 mm., p. 23. 



13. Cepolis latebrosa Dall, profile of imperfect specimen, p. 22. 



14. Cepolis direpta Dall, basal view, lat. 15 mm., p. 23. 



15. Cepolis instrumosa Dall, base, lat. 13.5 mm., p. 23. 



16. Cepolis crusta Dall, base, lat. 15 mm., p. 24. 



17. Cepolis latehrosa Dall, upper surface, lat. 16 mm., p. 22. 



18. Pleurodonte diespiter Dall, base, lat. 18 mm., p. 24. 



19. Cepolis latehrosa Dall, base, lat. 16 mm., p. 22. 



20. Pleurodonte diespiter Dall, upper surface, lat. 18 mm., p. 24. 



159 



