CHAP. XVI THE BRITISH ISLES 357 



elsewhere than in our islands, and thus tend to lead to a 

 more accurate knowledge of the geographical limitations 

 of the variations of our native species. 



List of the Species and Varieties of Land and Freshwater 

 Shells, which, so far as at present known, are believed 

 to be peculiar to the british isles, or not found on the 

 Continent. 



Testacelliclce. 



1. Testacella maugei, v. nigra, Collinge. Tenby. 



Lmiacidoc, 



2. Amalia gagates, v. rava, Williams. West England and Ireland. 



3. ,, ,, V. babori, Collinge. 



4. ,, sowerbyi, v. bicolor, Cockerel). Ealing. 



5. ,, ,, V, nigrescens, Roebuck. Wales and South ai;d 



South-west England. 



6. ,, ,, V. fusco-carinata, Cockerell. South of England. 



7. ,, ,, -y. nigro-carinata, Collinge. South-west of England. 



8. Liinax maximus, v. lilacina. Roebuck. 



9. ,, ,, V. pallido-dorsalis, Hudson. N. England. 



10. ,, ,, V. hedleyi, Collinge. Ireland. 



11. ,, flavus, -z;. sufFusa, Roebuck. England. Melanic form. 



12. ,, ,, V. grisea. Roebuck. England. Melanic form. 



13. ,, ,, V. lineolata, Collinge. Yorkshire. 



14. ,, marginatus, v. macula ta, Roebuck. Ireland and Western 



Britain. 



15. ,, ,, V. decipiens, Cockere'l. Ireland and England. 



16. Agriolimax laevis, v. pallida, Roebuck. 



17. ,, ,, u maculata, Cockerell. 



Arionidce, 



18. Arion ater, v. albo-lateralis, Roebuck. North Wales and I. of Man 



and Shetlands. Yery distinct. 



19. ,, 5, V. cinerea, Roebuck. England. 



20. .-_----- 



21. 

 22. 

 23. 



reticulata, Roebuck. Ireland, 

 hortensis, v. cserulea, Collinge. England and Ireland. 



,, V. fallax, Cockerell. England. Common at Boxhill. 

 circumscriptus, v. flavescens, Collinge. Scotland. 



24. Geomalacus maculosus, v. fasciata, Cockerell. Ireland. 



Helicidce, 



25. Hyalinia helvetica, v. bicolor, Cockerell. Kent. 



26. ,, ,, u viridans, Cockerell. 



27. ,, nitidula, v. lucens, Pulteney. Tenby. 



28. ,, crystallina, v. complanata, Jeffr. Near Bristol. 



29. ,, fulva, ^, viridula, Taylor. Yorkshire. 



30. Helix nemoralis, v. hibernica, Westl. Ireland. 



