450 The MoUuscan Family Plauorbidae 



PLATE 107 



Shells of Planorbidae 



1-4. Hclisomo corpuloition (Say). Lac la Croix, Ontario. Canada. U.I., Z32296. 



5. Helisoma corpulent lun (Say). Rainy Lake, Ontario, Canada. A type locality. BUOl. 



6. Helisoma corpulentum (Say). Rabbit Point, west of Sabaskong Bay, Lake of the 



Woods, Canada. A type locality. Resembles Say's figure. U.L, Z41286. 



7. Helisoma cor]>uletdum (Say). Lac la Croix, Ontario, Canada. U.L, Z32626. 



8. Helisoma corpulentum vennilioncnse F. C. Baker. Vermilion Lake, St. Louis Co., 



Minnesota. Holotype. B3021. 

 9,10. Helisoma coripulentum vermilionense F. C. Baker. Vermilion Lake, Minnesota. 

 Paratypes. B3014. 



11. Helisovia corpulentuvi vermilionense F. C. Baker. Vermilion Lake, Minnesota. 



Paratype, immature. U.L, Z32518. 



12. Helisoma corpulenlum multicostatiim F. C. Baker. Lake Kahnipiminanikok, 



Ontario, Canada. Holotype. U.L, Z32308. 



13. Helisoma corpulenlum (Say). Lac la Croix, Ontario, Canada. Young. U.L, Z32626. 



14. Helisoma corpulentuni vermilionense F. C. Baker. Vermilion Lake, Minnesota. 



Young. U.L, Z32627. 



15. Helisoma whiteavesi F. C. Baker. Lac des Mille Lacs, Canada. Young. U.L, 



Z32312. 

 16-18. Helisoma corpulentum multicostatum F. C. Baker. Kahnipiminanikok Lake, 

 Ontario, Canada. Paratypes. U.L, Z32307. 



19. Helisoma corpulentum multicostatum F. C. Baker. Knife Lake, Minnesota. U.L, 



Z29828. 



20. Helisoma corpulentum multicostatum F. C. Baker. Bemidji Lake, Beltrami Co., 



Minnesota. U.L, Z32475. 



21. Helisoma corpulentum multicostatum F. C. Baker. Kahnipiminanikok Lake, On- 



tario, Canada. Lnmature. U.L, Z32628. 



All figures are enlarged about P/^ diameters 



