480 The Molluscan Family Planorhidae 



PLATE 122 



Shells of Planorhidae 



1,2. Menetus cooperi F. C. Baker. Blue Lake, Grand Coulee, Washington. B3935. 



3-6. Menetus cooperi planospirus F. C. Baker. Orcas Island, Puget Sound, Wash- 

 ington. Figure 5, holotype; 3, 4, 6, paratypes. Figure 5 shows well the very 

 flat spire. M.C.Z., 31583. 



7. Menetus cooperi F. C. Baker. Two miles north of Petaluma, California. U.S.N.M., 



531171. 



8. Menetus cooperi calUoghjptus (Vanatta). Quamichan Lake, British Columbia. 



B2030. 

 9-12. Menetus cooperi multilincatus (Vanatta). Salem, Oregon. Type locality. B3929. 



13. Menetus cooperi crassilabris F. C. Baker. Colma, San Mateo Co., California. 



U.S.N.M., 525095. 



14. Promenetus exncuous (Say). Chimney Point, Hospital Creek, Lake Champlain, 



Vermont. U.S.N.M., 336591. 

 15-18. Promenetus exacuous (Say). New York, New York. B3930. 

 19. Promenetus exacuous (Say). West Lake Okoboji, Iowa. U.S.N.M., 475975. 

 20-22. Promenetus exacuous mcgas (Dall). Birtle, Manitoba. Types. U.S.N.M., 63391. 

 23-25. Menetus coloradoensis F. C. Baker. Swamp, head of Eldora Lake, near 



Eldora, Colorado. Figure 25, holotype; 23, 24, paratypes. U.C, 10114. 

 26-28. Promenetus exacuous variety? Gresham Lake, between Gresham and Ward, 



Boulder Co., Colorado. U.C, 526. 



All figures are enlarged about four diameters 



