460 The MoUuscan Family Plauorhidae 



PLATE 112 



Shells of Planorbidae 



1-6. Helisoma duryi seminole Pilsbry. Lake Apopka, Florida. Range of variation. 

 U.S.N.M., 506868. 



7,8. Helisoma duryi seminole PiLsbry. Lake Apopka. Florida. scalare-Wke forms. 



U.S.N.M., 506870. 

 9-11. Carinifex newberryi (Lea). Owens Lake, California. U.S.N.M., 251516. 

 12-14. Carinifex occidentalis Hanna. Eagle Lake, Lasen Co., California. U.S.N.M., 



120331. 

 15. Carinijex occidentalis Hanna. Eagle Lake, California. U.S.N. M., 120333. 

 16-21. Carinifex occidentalis Hanna. Eagle Lake, California. U.S.N.M., 120331. 



Figures 12-21 show range of variation 



All figures are enlarged about 1% times 



