PLATE 71 



1. Cerithlopsis subulata Montagu. 12 mm. p. 105. 



2. Cerithlopsis greenii C. B. Adams. 5 mm. p. 105. 



3. Trlphora perversa nigrocincta Adams. 10 mm. p. 104. 



4. Blttium alternatum Say. 7 mm. p. 107. 



5. Sella adamsl H. C. Lea. 10 mm. p. 105. 



6. Turbonllla elegantula Verrill. p. 89. 



7. Odostomia bisuturalis Say. 4.7 



8. Odostomia trifida Totten. 4 mm. 



9. Phytia myosotis Drap. young, p. 



10. Odostomia seminuda C. B. Adams. 3.8 mm. p. 90. 



11. Odostomia impressa Say. 4.8 mm. 



12. Onoba aculeus Gould, p. 97. 

 13 < Pyramidella producta Adams. 5 



14. Melanella intermedia Cantralne. 7.5 mm. p. 86. 



15. Pyramidella fusca Adams. 5.5 mm. 



16. Solariella obscura Couthouy. 7 



17. Hydrobia minuta Totten. '6.5 mm. 



18. Skenea planorbis Fabricius. 1.4 



19. Lacuna vincta Montagu. 8 mm. p. 101. 



20. Haminoea solitaria Say. 10 mm. p. 141. 



21. Cylichna alba Brown. 5 mm. p. 140. 



22. Acteon punctostriatus Adams. 4 mm. p. 138. 



23. Cylichnella oryza Totten. 4 mm. p. 140. 



24. Diaphana debilis Gould. 4 mm. p. 140. 



25,26. Retusa pertenuls Mighels, showing variations. 2.5 mm. p. 139. 



27. Acteocina canaliculata Say. 5 mm. p. 139. 



