xnT_ 



1 Oval Navicella. 2 Guiana Ampullaria. 3 Viviparous Paludina. 4 Pond Val- 

 vata. 5 Pellucid Vitrina. 6 Fountain Physa. 7 Bark Pirena. 8 Crowned Mela- 

 nia. 9 Pond Lymncea. 10 Ditch Lutea. 11 Keeled Planorbis. 12 Elegant 

 Cyclostoma. 13 /Mc/a^- Auricula. 14 Oblong Succinea. 15 Virgine Achatina. 16 

 Mountain Bulimm. 17 T^/^^■^e Planaria. IS Pimpled Clausilia. 19 Zeasi 

 Carychium. 20 Dwarf Vertigo. 21 J/oss Pjipo. 22 Greater Helicina. 2o 

 Ilaliotis-shaped Testacella. 24 ^S^ore Neritoides. 25 Globular Anastoma. 2t> 

 <Stone C'arocolla 27 G^ove ZTe^/x 28 Polished Melanopsis. 29 ^ec? Limax. 30 

 Rumpldiis's Dolabella. 31 Cup-shaped Parmacella. 



