452 The Molluscan Family Plauorhidae 



PLATE 108 



Shells of Planorbidae 



1-6. Helhoma cainpanulatum (Say). Cayuga Lake, New York. Type locality. U.S.N. M., 



212700. 

 7-9. Helkoma campanulatum (Say). North end Cayuga Lake, New York. Probable 



type locality. B1043. 

 \0,n. Hdkoma campanulatum (Say). Ottawa, Ontario, Canada. U.S.N.M., 120985. 

 12-14. Hdisoma campanulatum (Say). North end Canandaigua Lake, New York. 



B3859. 

 15-17. Hdisoma campanulatum (Say). Crooked Lake, Odcn, Michigan. Variation in 



size. U.L, Z19877. 



18. Hdisoma campanulatum fcrrmi F. C. Baker. Marl Lake, Fair Grounds, Joliet, 



Will Co., IlHnois. Holotype. U.L, P1068a. 



19. Hdisoma campanulatum ferrissi F. C. Baker. Same locality as above. Paratype. 



U.L, Pl068b. 



20-25. Hdisoma campanulatum ferrissi F. C. Baker. Same locality as above. Para- 

 types. U.L, P1068. 



26-28. Hdisoma campanulatum jcrrissi F. C. Baker. White Lake, Oakland Co., Michi- 

 gan. U.L, Z20908. 



29-31. Hdisoma campanulatum ferrissi F. C. Baker. Literior Charity Lsland, Michigan. 

 B3860. 



32-34. Hdisoma campanulatum ferrissi F. C. Baker. Lermond, Bonne Bay, Newfound- 

 land. B3858. 



All figures are enlarged about two diameters 



