CHAP. XII.] 



BERMUDA. 



261 



10. Helix microdonta. (Desh.) 



11. „ appressa. (Say.) ... 



12. „ pulchella. (Miill.)... 



13. „ ventricosa. (Drap.) 



14. Bulimulns nitidulus. (Pfr.) 



15. Stenogyra octoiia. (Ch.)... 

 It5. Cioneila acicula. (Miill.)... 



17. Pupa pellucida. (Pfr.) ... 



18. „ Barbadensis. (Pfr.) 



19. „ Jamaicensis. (C.B. Ad.) 



20. Helicina convexa. (Pfr.) 



... Bahama Islands. 



... Virginia and adjacent states; per- 

 haps introduced into Bermuda. 



... Europe; very close to H. minuta 

 (Say) of the United States. 

 Introduced into Bermuda (?) 



... Azores, Canary Islands, and South 

 Europe. 



... Cuba, Haiti, &c. 



... West Indies and South America. 



... Florida, New Jersey, and Europe. 



... West Indies, generally. 



... Barbadoes (?) 



... Jamaica. 



... Barbuda. 



Mr. Bland indicates only four species as certainly peculiar to 

 Bermuda, and another sub-fossil species ; while one or two of the 

 remainder are indicated as doubtfully identical with those of other 

 countries. We have thus at least one-fourth of the land-shells 

 peculiar, while almost all the other productions of the islands are 

 identical with those of the adjacent continent and islands. 

 This corresponds, however, with what occurs generally in islands 

 at some distance from continents. In the Azores only one 

 land-bird is peculiar out of eighteen resident species ; the beetles 

 show about one-eighth of the probably non-introduced species 

 as peculiar ; the plants about one-twentieth ; while the land- 

 shells have about half the species peculiar. This difference is 

 well explained by the much greater difficulty of transmission 

 over wide seas, in the case of land-shells, than of any other 

 terrestrial organisms. It thus happens that when a species has 

 once been conveyed it may remain isolated for unknown ages, 

 and has time to become modified by local conditions unchecked 

 by the introduction of other specimens of the original type. 



Flora of Bermuda. — Unfortunately no good account of the 

 plants of these islands has yet been published. Mr. Jones, in 

 his paper " On the Vegetation of the Bermudas " gives a list of 

 no less than 480 species of flowering plants ; but this number 

 includes all the culinary plants, fruit-trees, and garden flowers, 

 as well as all the ornamental trees and shrubs from various 

 parts of the world which have been introduced, mixed up with 

 the European and American weeds that have come with agricul- 

 tural or garden seeds, and the really indigenous plants, in one 



