506 The Molluscan Family Planorhidae 



PLATE 135 



Shells of Planorbidae 



1-3. Tropicorbis peregrinus (Orbigny). Montevideo, Uruguay. U.S.N. M., 535952. 



4. Tropicorbis peregrinus (Orbigny). Arroyo de Solon, Uruguay. U.S.N.M., 380999. 



5-8. Tropicorbis centimetralis (Lutz). From Lutz. U.S.N. M., 535956. 



9-11. Tropicorbis chilensis (Clessin). Peru. Lea Coll. from Paris Museum. U.S.N. M., 



126412. 

 12,13. Tropicorbis philippianus (Dunker). Lake near Coma de Ipaguaza, Bolivia 



(15 mi. N.E. of Yacuiba). U.S.N.M., 341049. 

 14-16. Tropicorbis meridaensis (Preston). Ruicon de Valle, near Caracas, Venezuela. 



U.S.N.M., 362132. 

 17-19. Tropicorbis bourcardiai^us (Preston). Manzanello, Mexico. L'.S.N.M., 219755. 

 20,21. Tropicorbis canonicus (Cousin). Soacha, near Bogata, Colombia. M.C.Z. 

 22,23. Tropicorbis canonicus (Cousin). 'La Picata' near Bogata, Colombia. M.C.Z. 

 24-27. Tropicorbis canonicus (Cousin). Ibarra, Ecuador. M.C.Z., 64967. 

 28-31. Tropicorbis trigyrus (Philippi). Small lake near Titicaca, Peru. (14,000 feet 



elevation). U.S.N.M., 271591. 

 32-35. Tropicorbis gracilentus (Gould). 30 miles S.W. of Santiago, Mexico. U.S.N.M., 



28384. 



All figures are enlarged about 2i/l> diameters 



