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Updated: May 28, 2025
First among the mammals we find the aplacentals, or those which bring forth immature young, which are grouped into two divisions, i.e., the monotremes, or one-vented animals, in which group belong the duck-bills, spiny ant-eaters, etc.; and the marsupials, or pouched animals, in which group belong the kangaroo, opossum, etc.
Numerous fossil remains of them have lately been discovered in the Mesozoic strata of Europe, Africa, and America. To-day there are only two surviving specimens of the group, which we place together in the family of the duck-bills, Ornithostoma. The Australian duck-bills are distinguished externally by a toothless bird-like beak or snout.
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