454 The Molluscan Family Planorhidae 



PLATE 109 



Shells of Planorbidae 



1-6. Helisoma campanulatum (Say). Pine Island Lake, Kent Co., Michigan. Exagger- 

 ated campanulate lip. B3922. 



7. Helisoma campanulatum wisconsinense (Winslow). Little Arbor Vitae Lake, Vilas 



Co., Wisconsin. Type locality. U.I.. Z18421. 



8. Helisoma campanulatum wisconsinense (Winslow). Tomahawk Lake, Wisconsin. 



B1718. 



9. Helisoma campanulatum wisconsinense (Winslow). Tomahawk Lake, Wiscon.sin. 



B1719. 

 10,11. Helisoma cantpanulatum wisconsinense (Winslow). Tomahawk Lake, Wisconsin. 



B1725. 

 12,13. Helisoma campanulatum wisconsinense (Winslow). Tomahawk Lake, Wisconsin. 



B3857. 

 14. Helisoma campanulatum smithii (F. C. Baker). Douglas Lake, Michigan. Holo- 



type. B1054. 

 15,16. Helisoma campanulatuui smithii (F. C. Baker). Douglas Lake, Michigan. Para- 

 types. B1728. 

 17-20. Helisoma campanulatum smithii (F. C. Baker). Douglas Lake, Michigan. Type 



locality. B3861. 

 21. Helisoma campanulatum rideauense F. C. Baker. Rideau River, Ottawa, Canada. 



Holotype. U.S.N.M., 346627. 

 22-24. Helisoma campanulatum rideauense F. C. Baker. Rideau River, Ottawa, 



Canada. Paratypes. U.S.N.M., 346627. 

 25. Helisoma campanulatum smithii (F. C. Baker). Douglas Lake, Michigan. Small 



form. B1056. 

 26-28. Helisoma midtirolvis (Case). Howe Lake, Marquette Co., Michigan. U.I.. 



Z23192. 

 29. Helisoma multivolvis (Case). Howe Lake, Marquette Co., Michigan. U.S.N. M., 



272274. 



All figures are enlarged about iy> diameters 



