MOLLUSCA. 



The few fresh-water Shells collected on the Expedition having been placed in 

 the hands of Mr. James De Carle Sowerby, he kindly furnished me with the fol- 

 lowing list, in the year 1828. 



Names. 



1. Helix attenuata 



2. ,, gularis . 



3. „ rudis 



4. „ paludosus (minuta, Say) 



5. „ albolabris 



6. Succinea putris . 



7. „ ovalis 



8. Bulimus lubricus 



9. Melampus bidentatus, Say (au-\ 



ricula, Lam., ConovuIus,^lon\L)\ 



10. Valvata tricarinata 

 11. 



Localities. 



Lakes Superior, Winipeg, and Saskatch. R. 



Ditto 

 Ditto 

 Ditto 

 Ditto 

 Ditto 

 Ditto 

 Ditto. 



ditto 

 ditto 

 ditto 

 ditto 



ditto, 

 ditto, 

 ditto, 

 ditto. 



to Methy Lake (lat. 57°). 

 to the Saskatchewan River. 



Ditto to the Saskatchewan River. 



Ditto to Methy Lake. 



Methy Lake to Great Rear Lake (lat. 65°). 



12. Planorbis campanulatus (Helix\ T , <-, • , , , , 



7 . o JL t- w \ }Lake Superior to Saskatchewan. 



angulata, sheph., JLin. Ir.) J r 



syncera 



13. 



35 



bicarinatus 



. 



Ditto 



ditto. 



14. 



)! 



trivalvis 



. 



Ditto 



ditto. 



15. 



>> 



sp. nova . 



. 



Ditto 



ditto. 



16. 



35 



albus . 





Ditto 



ditto. 



17. 



53 



sp. nova . 





Ditto 



ditto. 



18. 



5J 



sp. nova contorto similis 



Ditto 



ditto. 



19. 



53 



parvus 



Methy Lake. 





20. 



33 



sp. nova 



. 



Ditto to 



Great Bear Lake. 



21. 



55 



sp. nova . 



Saskatchewan. 





22. Ancillus rivularis, Say 



23. Physa rivalis 



24. „ turrita (elongata) Say 



{Bulla hypnorum, LlNN.) 



25. „ sn. nova 



26. ,. fontinalis . 



Methy Lake to Bear Lake. 



2 s 2 



