440 The Molluscan Family Planorbidae 



PLATE 102 



Shells of Planorbidae 



1. Hdisoma tenue chapaleme (Pilsbry). Proc. Acad. Sci. Phil., 1920, i>. 193, fig. 1. En- 



larged. 



2. Hclisoma contrerasi (Pilsbiy). Proc. Acad. Sci. Phil., 1920, \k 193, fig. 2. Enlarged. 

 3,4. Helisoma contrerasi (Pilsbry). Lake Chaiiala, near Guadalajara, Mexico. U.S.N.M., 



225863. 

 5-10. Hclimma ten tie ehapalense (Pilsbry). Oaxaca, Mexico. U.S.N.M., 117952. 

 11,12. Helisoma seal are (Jay). Caloosatchee Pliocene formation, Florida. B1106. 

 13,14. Helisoma scalare (Jay). Lake Griffin, near Leesburg, Florida. B1438. 

 15-18. Helisoma scalare (Jay). Head of Miami River, Everglades, Dade Co., Florida. 



B2969. 

 19,20. Helisoma scalare (Jay). Everglades, Florida. B3002. 

 21. Helisoma duryi seminole Pilsbry. Everglades, Florida. B2962. 

 22,23. Helisoma duryi seminole Pilsbry. Sumter Co., Florida. B2965. 



All figures, excepting 1 and 2. are enlarged about two diameters 



