422 The Molluscan Family Planorhidae 



PLATE 93 



Shells of Planorbidae 



1-3. Helisoma subcrenatum plexatum (Ing.). Great Falls. Montana. U.S.X.M., 183037. 



4. Helisoma occidentale (Cooper). Tule Lake, California. L'.S.X.M., 160S39a. 



5. Helisoma occidentale (Coojier). "Wa-^hington Territory.' Binney".s fig. 193. U.S.X.M.. 



9120. 



6. Helisoma occidentale (Cooper). Klamath Falls. Oregon. U.S.X.M.. 219750. 



7,8. Helisoma occidentale (Cooper). Upper Klamath Lake, .south boundary of reserva- 

 tion, Oregon. L'.M., 62741. 



9.10. Helisoma occidentale (Cooper). Lower end Upi)er Klamath Lake, Oregon. 

 B3246. 



11.12. Helisoma occidentale (Cooper). Slough at Wacos Bay, Klamath Lake, Oregon. 

 B3069. 



13.14. Helisoma occidentcde (Cooper). Uiqier Klamath Lake. Oregon. B3011. 



15. Helisoma occidentale (Cooper). Upper Klamath Lake, south boundary of reserva- 



tion. U.M., 62741. 



16. Helisoma occidentale depression F. C. Baker. Lower Klamath Lake, Oregon. 



Holotype. B3239. 

 17, 18. Helisovia occidentale depressum F. C. Baker. Lower Klamath Lake, Oregon. 



Paratypes. B3240. 

 19,20. Helisoma binneyi (Tr3'on). Portland, Oregon. Stanford Univ., B3220. 

 21,22. Helisoma binneyi (Tryon). Lake Whatcom, Washington. B853. 

 23-26. Helisoma binneyi (Tryon). Holders Lake, Xanaimo, British Cohunbia. U.AL. 



81750. 



All figures are enlarged about l^-'> diameters 



