The Elephant Of
Sumatra, Borneo, And Malacca Is Now Considered To Be Identical With
That Of Ceylon And India.
In all other groups of Mammalia the same general phenomena recur.
A few species are identical with those of India.
A much larger
number are closely allied or representative forms, while there
are always a small number of peculiar genera, consisting of
animals unlike those found in any other part of the world. There
are about fifty bats, of which less than one-fourth are Indian
species; thirty-four Rodents (squirrels, rats, &c.), of which six
or eight only are Indian; and ten Insectivora, with one exception
peculiar to the Malay region. The squirrels are very abundant
and characteristic, only two species out of twenty-five extending
into Siam and Burma. The Tupaias are curious insect-eaters,
which closely resemble squirrels, and are almost confined to the
Malay islands, as,are the small feather-tailed Ptilocerus lowii
of Borneo, and the curious long-snouted and naked-tailed Gymnurus
rafllesii.
As the Malay peninsula is a part of the continent of Asia, the
question of the former union of the islands to the mainland will
be best elucidated by studying the species which are found in the
former district, and also in some of the islands. Now, if we
entirely leave out of consideration the bats, which have the
power of flight, there are still forty-eight species of mammals
common to the Malay peninsula and the three large islands. Among
these are seven Quadrumana (apes, monkeys, and lemurs), animals
who pass their whole existence in forests, who never swim, and
who would be quite unable to traverse a single mile of sea;
nineteen Carnivora, some of which no doubt might cross by
swimming, but we cannot suppose so large a number to have passed
in this way across a strait which, except at one point, is from
thirty to fifty miles wide; and five hoofed animals, including
the Tapir, two species of rhinoceros, and an elephant. Besides
these there are thirteen Rodents and four Insectivora, including
a shrew-mouse and six squirrels, whose unaided passage over
twenty miles of sea is even more inconceivable than that of the
larger animals.
But when we come to the cases of the same species inhabiting two
of the more widely separated islands, the difficulty is much
increased. Borneo is distant nearly 150 miles from Biliton, which
is about fifty miles from Banca, and this fifteen from Sumatra,
yet there are no less than thirty-six species of mammals common
to Borneo and Sumatra. Java again is more than 250 miles from
Borneo, yet these two islands have twenty-two species in common,
including monkeys, lemurs, wild oxen, squirrels and shrews. These
facts seem to render it absolutely certain that there has been at
some former period a connection between all these islands and the
mainland, and the fact that most of the animals common to two or
more of then, show little or no variation, but are often absolutely
identical, indicates that the separation must have been recent in
a geological sense; that is, not earlier than the Newer Pliocene
epoch, at which time land animals began to assimilate closely with
those now existing.
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