In land-shells this
law of distribution does not appear to hold good. In my very small
collection of insects, Mr. Waterhouse remarks that of those which
were ticketed with their locality, not one was common to any two of
the islands.
TABLE 17/1.
Column 1 : Name of Island.
Column 2 : Total Number of species.
Column 3 : Number of species found in other parts of the world.
Column 4 : Number of Species confined to the Galapagos
Archipelago.
Column 5 : Number confined to the one island.
Column 6 : Number of Species confined to the Galapagos
Archipelago, but found on more than the one island.
James : 71 : 33 : 38 : 30 : 8.
Albemarle : 46 : 18 : 26 : 22 : 4.
Chatham : 32 : 16 : 16 : 12 : 4.
Charles : 68 : 39* : 29 : 21 : 8.
*(or 29, if the probably imported plants be
subtracted.)
If we now turn to the Flora, we shall find the aboriginal plants of
the different islands wonderfully different. I give all the
following results (Table 17/1) on the high authority of my friend
Dr. J. Hooker. I may premise that I indiscriminately collected
everything in flower on the different islands, and fortunately kept
my collections separate.
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