246 



DISTRIBUTION 





Name. 



In Britain. 



In Europe. 



Lymnsea limosa .... 







palustris .... 







stagnalis .... 



England, cbiefly middle 







and south. Ireland. 



Nearly throughout . . . 



trancatula .... 







Neritina fluviatilis . 



Chiefly south-west and east 







of England and Ireland 





Paludina contecta . . . 



England, chiefly middle 









Chiefly Central .... 



vivipara .... 



England, chiefly middle 







and south 



Chiefly Central .... 



Physa hypnorum 



Throughout 



North and Central . . . 



fontinalis .... 







Pisidium amuicum . 







Casertanuin 



Throughout 



Central and South . . 



Henslowianum 



England and Ireland . 





obtusale .... 



Throughout 



Throughout 



nitidum .... 







pulchellum . . . 





Central and South . . . 



pusillum .... 



Throughout 



North and Central . . . 



Planorbis albus .... 



Throughout 





■ carinatus .... 



England and Ireland . . 



Throughout, but partial . 



coraplanatus . . . 







contortus .... 







corneus 



Middle and south-east of 







England and Ireland . 



Nearly throughout ... 



crista 





Throughout 



fontanus .... 







glaber 







nitidus 



Throughout, chiefly south 



Chiefly Central .... 



spirorbis .... 







vortex 



Throughout 





Pupa Anglica .... 







cylindracea 



Throughout 





muscorum .... 







secale 



England, chiefly south and 









Central and South . . 



Succinea elegans 







oblonga . 



Throughout, rare and local 











Testacella baliotidea . 



England and Ireland, 







chiefly south .... 



Central and South . . . 





Central and south of Eng- 







land and Ireland 



Central and South . . . 



Unio margaritifer . . . 







