496 Tiie Molluscan Family Planorbidae 



PLATE 130 



Shells of Planorbidae 



1-3. Tropicorbis gracilcntus (Gould). Colorado Desert. Binney's fig. 183, p. 108. Holo- 



type. U.S.N.M., 26477. 

 4-12. Tropicorbis gracilentus (Gould). San Marcos, Texas, in drift adjoining fish 



hatchery. Figure 10 shows closely coiled whorls like those of Tropicorbis orbi- 



culus. B3298. 

 13-17. Tropicorbis maya (Morelet). Merida, Yucatan. M.C.Z., 59646. 

 18-20. Tropicorbis hovancnsis (PfeifTer). Havana, Cuba. Type locality. U.M., 84039. 

 21-25. Tropicorbis havaiicnsis (Pfciffer). New Orleans, Louisiana. A small \-ariety. 



B3954. 

 26. Tropicorbis havancnsis (Pfeiffer). Guayos, Santa Clara Prov., Cuba. U.M., 84038. 

 27-28. Tropicorbis havanensis (Pfeiffer). New Braunfels, Texas. M.C.Z., 13622. 

 29-32. Tropicorbis philippiamis (Dunker). Asuncion, Paraguay. Figure 31, loosely 



coiled. M.C.Z., 62490. 

 33,34. Tropicorbis philippianm (Dunker). Espcranza dc Santa Fe, Argentina. M.C.Z., 



64963. 

 35-37. Tropicorbis centimeimlis (Lutz). Ceara Miriin, Rio Grande do Norte, Brazil. 



Type locality. M.C.Z., 92825. 

 38-41. Tropicorbis })crc(jrinus (Orbigny). Rio Grande de Sul, Brazil. M.C.Z., 75376. 



All figures are enlarged about two diameters 



