390 The Molluscan Family Pla7iorbidae 



PLATE 77 



Shells of Planorbidae 



1-3. Gyraulus albus (Miiller). Pond in jiark in Krolikarnia. a suburb of Warsaw, 

 Poland. Baker coll., 3968. X4. 



4-6. Gyraulus parvus (Say). Blue Pond, Wheatland Center Road, Monroe Co., New- 

 York. U.I., 41369. X4. 



7-9. Tropicorbis orbiculus (Morelet). Drift at falls, Valles, Mexico. U.I., 28525. X2. 



10-12. Tropicorbis pallidus (C.B.Adams). Kingston, Jamaica. U.I. , 40466. X4. 



13-15. Taphius andecolus (Orb.). Lake Titicaca, Peru. U.L, 40595. Xl^/.. 



16-18. Anisus leucostoinus (Millet). Small pond in Bielany Park, Warsaw, Poland. 

 Baker coll., 3969. X4. 



19. Anisus vortex (Linn.). Stream in meadow in Jab-Tonna, 18 km. northeast of 

 Warsaw, Poland. Baker coll., 3971. X2. 



20-22. Anisus spirorbis (Linn.). Pond at Scarborough, England. Baker coll., 1234. X4. 



23-25. Bathyomphalus contortus (Linn.). Drewnica, 4 km. northea.st of Warsaw, 

 Poland. Baker coll., 3972. X4. 



26-28. Planorbis planorbis (Linn.). A pond 25 km. southeast of Warsaw, Poland. 

 Baker coll., 3970. X2. 



29-31. Australorbis glabrotus (Say). San Juan, Puerto Rico. M.C.Z., 65218. XP/o. 



