242 



DISTRIBUTION 



Name. 



Achatina acicula 



Acme lineata . . . 



Ancylus fluviatilis . 



lacustris 



Anodonta cygnea . 



Arion ater . . . 



hortensis . 



Assiminea Grayana 

 Azeca tridens . . 

 Balea perversa . . 

 Bulimus acutus. . . 



montarms . . 



obscurus 



Bythinia Leacbii 



similis . . . 



tentaculata 



Carychium minimum 

 Clausilia biplicata . 



laminata 



perversa 



Kolphii . . 



Conovulus bidentatus 



denticidatus . 



myosotis 



Cyclas cornea 

 lacustris 



ovalis 



Pisidioides 



rivicola 



Cyclostoma elegans . 

 Dreissena polymorpha 



In Britain. 



England and Ireland 



Throughout 

 Throughout 

 Throughout 

 Throughout 

 Throughout 



Nearly throughout . . . 



Greenwich and Woolwich 



England 



Throughout 



South and west of England 

 and Ireland .... 



South and west of England 

 and Ireland .... 



Throughout 



Throughout 



England 



Throughout 



Throughout 



Central and south of Eng- 

 land 



England, chiefly south. 

 Ireland, rare .... 



Throughout 



Middle and south of Eng- 

 land 



North, south, and west of 

 England and Ireland . 



South and south-west of 

 England 



South and south-west of 

 England 



Throughout 



England and Ireland . . 



England 



South of England . 



Metropolitan, middle, and 

 north of England. Ire- 

 land, Dublin .... 



England, south of York- 

 shire 



Throughout 



In Europe. 



Throughout 



Throughout 

 Throughout 

 Throughout 

 Throughout 

 Throughout 



Nearly throughout 



Central . . 

 Throughout 



South and West . 



Central .... 

 Throughout . . 

 Throughout . . 

 Central and South 

 Throughout . . 

 Throughout . . 



Central .... 



Nearly throughout 

 Throughout . . 



Central .... 

 South and West 

 South and West 

 Central and South 



Throughout 

 Throughout 

 Central . . 



Central. . . . 



Central and South 

 Throughout . . 



