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. 



Testacellidce. 



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



Limacidoc. 



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



3. ,, V. babori, Collinge. 



4. ,, sowerbyi, v. bicolor, Cockerell. Ealing. 



5. ,, V. nigrescens. Roebuck. Wales and South and 



South-west England. 



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



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



8. Liinax maximus, v. lilacina. Roebuck. 



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



10. ,, V. hedlfvyi, Collinge. Ireland. 



11. ,, flavus, V. suftusa, 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, Cockerell. Ireland and England. 



16. Agriolimax lee vis, v. pallida. Roebuck. 



17. ,, macu'ata, Cockerel! 



Arionidoe. 



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



and Shetlands. Very distinct. 



19. V. cinerea. Roebuck, England. 



20. ,, ,, V. reticulata, Roebuck. Ireland. 



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



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



23. ,, circumscriptus, v. flavescens, Collinge. Scotland. 



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



Helicidcc. 



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



26. ., ,, V. viridans, Cockerell. 



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



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



29. ,, fulva, V. viridula, Taylor. Yorkshire. 



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



