<88 THE NAUTILUS. 



1. Unio complanatus Sol. Outlet. 



2. Lampsilis luteolus Lam. Lake. 



3. Lampsilis iris Lea. Outlet. 



4. Alasmodonta rugosa Barnes. Outlet and Lake. 



5. Alasmodonta pressa Lea. Outlet, rare. 



6. Alasmodonta marginata. Say. Outlet. 



7. Anodonta grandis Say. Outlet. 



8. Anodonta excurvata De Kay. Inlet. 



9. Anodonta fragilis Lam. Inlet. 



10. Anodonta impllcata Say. Lake. 



11. Anodonta footiana Lea. Outlet, rare. 



12. Anodonta salmonia Lea. Outlet. 



13. Anodonta simpsoniana Lea. Lake, rare. 



14. Anodonta leivisii Lea. Lake. 



15. Anodontoides subcyliiidraceus Lea. Outlet, rare. 



16. Anodontoides fcrrussacianus Lea. Outlet, rare. 



17. Sphcerium striatinum Lam. Lake. 



18. Sphcerium rhomboideum Say. Lake. 



19. Sphcerium simile Say. Lake. 



20. Polygyra albolabris Say. Glens. 



20a. Polyc/yra albolabris var. dentata Walk. Glens, rare. 



21. Polygyra thyroides Say. Glens. 



22. Polygyra sayii Binn. Glens. 



23. Polygyra palliata Say. Glens. 



24. Polygyra appressa Say. Glens, rare. 



25. Polygyra fallax Say. Glens, rare. 



26. Polygyra trldentata Say. Glens. 



27. Polygyra monodon Rack. Glens, rare. 



28. Polygyra hirsata Say. Glens, rare. . 



29. Pyramidula alternata Say. Glens. 



30. Ompbalina fuliginosa Griff. Glens. 



31. Omphallna inornata Say. Glens. 



32. Circinaria concava Say. Glens/ 



33. Succinea obliqua Say. Glens. 



34. Oochlicopa lubrica Miill. Shores. 



35. Vallonia pulchella Miill. Shores. 



36. Limncea stagnalis Linn. Lake. 



37. Limncea emarginata Say. Lake. 



38. Limncea palustris Miill. Lake, rare. 



