476 The Molluscan Family Plauorbidac 



PLATE 120 



Shells of Planorbidae 



1-10. Menetus opercularis (Gould). Mountain Lake, San Francisco, California. 



U.S.N.M., 47627. 

 11,12. Menetus cooperi F. C. Baker { = planulatus Cooper). Whidby's Island, Puget 



Sound, Washington. Type locality. U.S.N.M., 152185. 



13. Menetus cooperi F. C. Baker. Whidby's Island, Puget Sound, Washington. Holo- 



type of M. planulatus. Binney's fig. 209 (No. 9118). U.S.N.M., 29280a. 



14. Menetus cooperi F. C. Baker. Whidby's Island, Puget Sound, Washington. Co- 



type of M. planulatus. U.S.N.M., 29280. 



15-18. Menetus cooperi F. C. Baker. Lake Union, Washington. U.S.N.M., 253617. 



19-21. Menetus cooperi callioglyptus (Vanatta). Freeport, Washington. Cotypes. 

 Hemphill coll. U.S.N.M., 47630. 



22. Menetus cooperi F. C. Baker. Olga, Washington. U.S.N.M., 216936. 



23-26. Menetus cooperi rnultilineatus (Vanatta). Pass Lake, Fidalgo Island, Washing- 

 ton. U.S.N.M., 346742. 



27. Menetus cooperi F. C. Baker. Bellingham, Washington. Very flat spire. IT .S.N. M., 



525100. 



28. Menetus cooperi F. C. Baker. Lake Washington, Seattle, Washington. U.S.N, M., 



169070. 

 29-31. Menetus cooperi midtilineatus (Vanatta). Salem, Oregon. Type locality. B3927. 

 32. Parapholyx solida optima (Pilsbry). Lake Bigler, Nevada. Paratype. A.N.S.P., 



125363. 



Figures 1-31 are enlarged about four diameters; fig. 32 

 is enlarged two diameters. 



