CHAP. XII.] 
BERMUDA. 
261 
10. Helix microdonta. (Desh.) 
11. „ appressa. (Say.) ... 
12. „ pulchella. (Miill.)... 
13. „ ventricosa. (Drap.) 
14. Bulimulus nitidulus. (Pfr.) 
15. Stenogyra octona. (Ch.)... 
16. Cionella acieula. (Miill.)... 
17. Pupa pellucida. (Pfr.) ... 
18. ,, Barbadensis. (Pfr.) 
19. „ Jamaieensis. (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 Indi'es 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 
