446 The Molluscan Family Plauorhidae 



PLATE 105 



Shells of Planorbidac 



1-3. Helisoma duryi nurtnale Pilsbry. Everglades 40 miles from Ft. Meyers, Florida. 



M.C.Z., 71020. 

 4-8. Helisoma duryi intercalarc (Pil.^bry). East shore Lake Okeechobee, Palm Beach 



Co., Florida. M.C.Z. 

 9. Helisoma duryi intercalarc (Pilsbry). Beecher Spring, Wakulhi, Wakullii Co., 



Florida. U.S.N.M., 153079. 

 10.11. Helisoma duryi iuterccdare (Pilsbry). Lake Je.ssup, Florida. U.S.X.M., 167040. 

 12,13. Helisoma duryi intercalarc form alternalum Pilsbry. Blue Creek, Lake Co., 



Florida. Type locality. M.C.Z., 83729. 

 14-16. Helisoma duryi eudiscus Pilsbry. Head of Miami River, near Miami, Dade 



Co., Florida. Paratypes. B3074. 

 17-19. Helisoma duryi eudiscus Pilsbry. Silver Springs, Marion Co., Florida. Varying 



toward intercalare. B3073. 

 20-27. Helisoma duryi prcglabratum (Marshall). Canal, Palm Beach Co., Florida. Type 



locality. M.C.Z. , 46572. 



AH figures are enlarged about lY^ diameters 



