456 The MoUuscan Family Planorhidae 



PLATE 110 



Shells of Planorbidac 



1-4. Helisoma cainpanulatum wiscon-'iinensc (Winslow). Tomahawk Lake, Wisconsin. 



1, 2. Immature. 3, 4, Small form. U.I., Z29858. 

 5-7. Helisoma campanulatum near variety smithii (F. C. Baker). Douglas Lake, 



Michigan. U.I.. Z13957. 

 8-10. Helisoma campanulatum smithii (F. C. Baker). Doughis Lake, Michigan. Small 



form. B1056. 



11. Helisoma campamilatum canadense F. C. Baker. Bamiji Lake, Ontario, Canada. 



Holotype. U.L, Z30721. 



12, 13. Helisoma campanulatum canadense F. C. Baker. Bamiji Lake, Ontario, Canada. 



Paratypes. U.L, Z30721. 

 14. Helisoma campanulatum canadense F. C. Baker. Brent Lake, Ontario, Canada. 



U.L, Z41303. 

 15-17. Helisoma campanulatum canadense F. C. Baker. Lake near Lake Mercutio, 



Ontario, Canada. Variation in size. LT.L, Z40064. 

 18-20. Helisoma campanulatuin canadense F. C. Baker. Sturgeon Lake, Ontario, 



Canada. Variation in size. U.L, Z32331. 

 21. Helisoma campanulatum pleistocenicum F. C. Baker. White Pond, Marlboro, New 



Jersey. Holotype. U.S.N.M., 121195. 

 22-26. Helisoma campanulatum pleistocenicum F. C. Baker. AVhite Pond, Marlboro, 



New Jersey. Paratypes. U.S.N.M., 121195. 

 27-35. Helisoma campanulatum collinsi F. C. Baker. Cameron Lake, Lake of the 



Woods, Canada. Variation in size. U.L, Z41297. 



All figures are enlarged about two diameters 



