250 



DISTRIBUTION 



Eastern Hemisphere. 



Name. 



Achatina . 

 Aucylus . 



Anodonta 

 Arion . 

 Assiminea. 

 Azeca . . 

 Balea . 

 Bulimus . 

 Bythinia . 

 Caiychium 

 Clausilia . 



Conovulus. 



Cyclas 



Cyclostonia 



Dreissena 

 G-eomalacus 

 Helix . 

 Lhnas. 



Lymnsea 

 Neritina 



Paludina . 



Physa . 



Pisidium 



Planorbis 



Pupa . . 



Succinea . 



Testacella 

 Unio . . 

 Valrata . 

 Vertigo . 

 Viti'ina . 



Countries in which there are other Species. 

 Of European type. Of other types. 



Ceylon, Hindostan 



Siberia, Teneriffe, Natal, Bengal, 

 New Zealand 



Siberia. 



North Africa, Madeira, Canaries. 

 Azores, Madeira, Tristan d' Acunha 



Asia Minor 



Asia, North Africa. 

 Siberia, India, North Africa. 

 Asia Minor, Madeira, Egypt, In- 

 dia, China, Japan 



New Zealand 

 North Africa 



Various 



New Zealand, Mauritius, Ascen- 

 sion Island, South Africa. 

 Western Asia, Thibet .... 

 Asia Minor, Egypt 



Siberia, Japan, Hindostan, Philip- 

 pine Islands, Central Africa 



Syria, China, Singapore, Philip- 

 pine Islands 



Lycia, India, New Zealand 



Ceylon, India, Burmah, South 



Africa, Australia. 

 Asia Minor, Madeira, Canaries, 



India, Ceylon 



India, China, South and West 



Africa, Australia, Tasmania. 

 Canaries. 



Various 



Siberia. 



P 



Zonitcs 

 Zua . 



Madeira, Philippines, Ceylon, In- 

 dia, Siam, Malayan Islands, 

 Australia, New Caledonia. 



? 



Madeira. 



West Africa. 



Tasmania. 



Various. 

 ? 



Various. 



Cambojia. Siam. 



Borneo. 



Madagascar. 



Senegal. 



Various. 



India, Malayan Islands, Australia. 

 Philippines, Madagascar, Ceylon, 



Hindostan, Africa, Australia. 

 Siberia, Japan, Siam, Bengal, 



China, Philippine Islands. 

 Egypt, Natal, Australia, New 



Zealand. 



. ? 



Asia Minor, Madagascar, South 

 Africa, Australia, New Zealand. 



Various. 



