424 The Molluscan Faniilij Plaiwrbidae 



PLATE 94 



Shells of Planorbidae 



1-5. Helisoma hinneyi randolphi F. C. Baker. Seattle, Washington. Figure 1, holotype; 



2-4, parat.ypes; 5, immature. U.S.X.M., 504360. 

 6-8. Helisoma hinneyi randolphi F. C. Baker. Green Lake, Seattle, Washington. About 



half grown. U.S.N.M., 474779. 

 9-11. Helisoma hinneyi (Tryon). Astoria, Oregon. B1888. 

 12,13. Helisoma bi)tiieyi (Tryon). Portland, Oregon. Immature. LT.L, Z35295. 



14. Helisoma antmon (Gould). Spring Valley, San Mateo Co., California. Immature. 



U.M., 84105. 



15. Helisoma ammoii (Gould). Near Cerritos, Los Angeles Co., California. Immature. 



U.S.N.M., 174051. 



16. Helisoma hinneyi (Tryon). Astoria, Oregon. Back view of shell. U.I., Z18459. 



17. Helisoma ammon (Gould). Monterey, Monterey Co., California. Back view of 



•shell. U.M., 81746. 



18. Helisoma hinneyi (Tryon). Oregon. Tyi)e. Gould's figure of Planorhis corpnlentum 



Say, U.S. Ex. Exped., plate 8, fig. 130. U.S.X.M., 5530. 



19. Hilisotna hinneyi (Tryon). Columbia River, Oregon. Binney's fig. 191 of Planorhis 



corpulentum Say. U.S.N.M., 8119. 

 20.21. Helisoma ammon (Gould). Hollister, San Benito Co., California. U.M., 81748. 

 22-24. Helisoma ammon (Gould). Stockton, San Joachin Co., California. B3246. 

 25,26. Helisoma a)nmon (Gould). San Joachin River, California. I'.M., 81749. 



27. Helisoma amnion (Gould). San Diego, California. TT.M., 35676. 



28. Helisoma am>no)i (Gould). Stockton, San Joachin Co., California. Immature. 



U.M., 81571. 



All figures are enlarged about II/2 diameters 



