472 The MoUuscan Family Planorbidae 



PLATE 118 



Shells of Planorbidae 



1. Planorbula armigcra (Say). East Nebraska. U.S.N.M., 526054. 



2. Planorbula armigera palustris F. C. Baker. Mason City, Iowa. U.S.N.M., 527656. 



3. Planorbula crassilabris (Walker). Douglas Lake, Michigan. U.S.N.M., 251213. 



4. Planorbula armigera indianensis F. C. Baker. Mt. Vernon, Indiana. U.I., Z2891. 



5. Planorbula jenksii (H. F. Carpenter). Nayat, Rhode Ishind. B1195. 



6. Planorbula smithi F. C. Baker. Stevenson, Alabama. U.S.N.M., 321196. 



7. Planorbula ivhcatleyi (Lea). Bohgee, Alabama. B1194. 



8. Planorbula campestris (Dawson). High Bluff, Manitoba. U.S.N.M., 63393. 



Figures 1-8 show the folds within the aperture of each species 



9. Planorbula armigera (Say). East Nebraska. U.S.N.M., 526054. 



10. Planorbula jenksii (H. F. Carpenter). Medford, Massachusetts. U.S.N.M., 41411. 



11. Planorbula smithi F. C. Baker. Stevenson, Alabama. U.S.N.M., 321196. 



12. Planorbula smithi F. C. Baker. Stevenson, Ahibama. Specimen with double 



parietal lamella. U.S.N .M., 321196. 



Figures 9-12 show the form of the parietal lamella in three species 



13-15. Planorbula armigera (Say). East Nebraska. U.S.N .M., 526054. 



16. Planorbula armigera variety? Camp Colfax, La Porte Co., Indiana. U.I., Z27094a. 



17-19. Planorbula armigera variety? Camp Colfax, Indiana. U.I., Z27094b. 



20-22. Planorbula crassilabris (Walker). Hamtramck, Wayne Co., Michigan. Type 



locality. B1200. 

 23-25. Planorbula crassilabris (Walker). Carr's Slough, Brookston, White Co., Indiana. 



U.I., Z27086. 

 26. Planorbula armigera variety? Big slough near Mason City, Iowa. Pathologic. 



U.S.N.M., 527656. 

 27-30. Planorbula jenksii (H. F. Carpenter). Nayat, Rhode Island. B1195. 



31. Planorbula armigera (Say). East Nebraska. U.S.N.M., 526054. 



32. Planorbula crassilabris (Walker). Brookston, Indiana. U.I., Z27086. 



33. Planorbula wheatleyi (Lea). Boligee, Alabama. B1194. 



Figures 31-33 show condition of crest behind aperture 

 All figures are enlarged about four diameters 



