502 The Molluscan Family Planorhidae 



PLATE 133 



Shells of Planorhidae 



1-3. Tropicorbis petenensis Morelet. Tehaimtepec, Mexico. M.C.Z., 64995. 



4-9. Tropicorbis tcpiceiisis (Martens). Tepic, Guadalajara, Mexico. U.S.N.M., 102211. 



10-13. Tropicorbis heloicus (Orbigny). In small creek back of the Cerro, Montevideo, 



Uruguay. Type locality. U.S.N.M., 535720. 

 14-17. Tropicorbis nigrilabris (Lutz). Rio de Janeiro, Brazil. Type locality. U.S.N.M., 



535713. 

 18-21. Tropicorbis janeirensis (Clessin). Bahia, Brazil. U.S.N.M., 152677. 

 22. Tropicorbis schrammi (Crosse). Martinique. M.C.Z., 113883. 

 23,24. Tropicorbis schrammi (Crosse). Antigua. U.I., Z40465. 

 25-27. Tropicorbis dcclivis (Tate). Nicaragua. U.S.N.M., 24006. 

 28-33. Tropicorbis obstructiis (Morelet). Pool at Piste, Yucatan. M.C.Z., 59754. 

 34,35. Tropicorbis obstructus (Morelet). Falls of the Valles River, Valles, Mexico. 



B2117. 

 36-40. Tropicorbis obstructus anodontus (Pilsbry). Reservoir north of Guatemala City, 



Guatemala. Type locality. B2061. 



All figures are enlarged about three diameters 



