248 



DISTRIBUTION 



Name. 



Unio pictorum 



tumidus 



Valvata cristata 



piscinalis 



Vertigo alpestris 



antivertigo 



edentula 



minuta . 



Moulinsiana 



pusilla , 



pygmsea 



striata . 



vertigo . 



Vitrina pellucida 

 Zonites alliaria . 

 cellarius 



crystallinus 



excavatus . 



nitidulus . 



nitidus . . 



purus . . 



radiatulus . 



Zua subcylindrica 



In Britain. 



England, chiefly south and 

 east 



England, chiefly south and 

 east 



Throughout 



Throughout 



North of England . . . 



England and Ireland . 



Throughout 



Throughout, rare . 



West of Ireland ? . . . 



England and Ireland, 

 chiefly south and east . 



Throughout 



Throughout 



West of England and Ire- 

 land 



Throughout 



Throughout 



Throughout 



Throughout 



Throughout, but local 



Throughout 



Throughout 



Throughout 



Throughout 



Throughout ..... 



In Europe. 



Throughout . 



North and Central 

 Throughout . . 

 Throughout . . 

 North aud Central 

 Throughout . . 

 North and Central 

 Throughout . 

 Central. . . . 



North and Central 

 Throughout . . 

 Central . . . 



Central . . . 

 North and Central 

 Throughout . 

 Throughout . . 



Throughout . . 

 North and Central 

 Throughout . . 

 Central and South 



North and Central 

 Central . . . 

 Throughout . . 



TOTAL. 



Species inhabiting Britain throughout 76 



Species inhabiting England and Ireland, only 20 



Species inhabiting England only 29 



Species inhabiting Ireland only 3 



128 



Of our 128 British species, there ai'e, therefore, in 



Scotland 76 



England 125 



Ireland 99 



