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This line will separate the Malayan and all the Asiatic races, from the Papuans and all that inhabit the Pacific; and though along the line of junction intermigration and commixture have taken place, yet the division is on the whole almost as well defined and strongly contrasted, as is the corresponding zoological division of the Archipelago, into an Indo-Malayan and Austro-Malayan region.
All these striking peculiarities are found also in those islands which form the Austro-Malayan division of the Archipelago. The great contrast between the two divisions of the Archipelago is nowhere so abruptly exhibited as on passing from the island of Bali to that of Lombock, where the two regions are in closest proximity.
However various may be the effects of climate, however unequal the means of distribution; these will never altogether obliterate the radical effects of long-continued isolation; and it is my firm conviction, that when the botany and the entomology of New Guinea and the surrounding islands become as well known as are their mammals and birds, these departments of nature will also plainly indicate the radical distinctions of the Indo-Malayan and Austro-Malayan regions of the great Malay Archipelago.
I term these respectively the Indo-Malayan and the Austro-Malayan divisions of the Archipelago. On referring to pages 12, 13, and 36 of Mr. Earl's pamphlet, it will be seen that he maintains the former connection of Asia and Australia as an important part of his view; whereas, I dwell mainly on their long continued separation.
Instead also of the various birds which exist in other parts of the world, it has the mound-making brush-turkeys, the cockatoos, and the brush-tongued lories, as well as honey-suckers, to be found in no other part of the world. These peculiarities are discovered in the other islands I have mentioned, forming the Austro-Malayan division of the archipelago.
The first is the small flying opossum, Belideus ariel, a beautiful little animal, exactly line a small flying squirrel in appearance, but belonging to the marsupial order. The other three are species of the curious genus Cuscus, which is peculiar to the Austro-Malayan region. These are opossum-like animals, with a long prehensile tail, of which the terminal half is generally bare.
They, in fact, belonged to an order of birds closely allied to the gallinaceous tribe, and representing it on the continent of Australia as also in several of the Austro-Malayan islands, where the true gallinaceae do not exist.
Wallace gives the name Indo-Malayan, are Malays; those of the latter, the Austro-Malayan, are Papuans.
If, however, I am right in my supposition that the region where the dividing line of the Indo-Malayan and Austro-Malayan regions of zoology can now be drawn, was formerly occupied by a much wider sea than at present, and if man existed on the earth at that period, we shall see good reason why the races inhabiting the Asiatic and Pacific areas should now meet and partially intermingle in the vicinity of that dividing line.
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