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As we have no complete skeletons of these early mammals we must abstain from picturing their external appearance. It is enough that the living Monotreme and Marsupial so finely illustrate the transition from a reptilian to a mammalian form. There may have been types more primitive than the Duckbill, and others between the Duckbill and the Marsupial.
Indeed, all, even to Duckbill, would be flattered and demonstrative of pride in the alliance. A fortnight later Duckbill again intercepted me. Since the previous verbal encounter I had gone armed. He carried, somewhat ostentatiously, a tomahawk and a couple of nulla-nullas. "No good you keep'm that fella Tchoosie. Me bin look out plenty. That fella belonga me.
In the same way their affinities are seen to be with the lowest of mammals, the MONOTREMES and MARSUPIALS. The monotremes, such as the duckbill mole and the spiny ant-eater of Australia, reproduce by means of eggs resembling those of reptiles; the marsupials, such as the opossum and the kangaroo, bring forth their young alive, but in a very immature condition, and carry them for some time after birth in the marsupium, a pouch on the ventral side of the body.
The duckbill or Ornithorhynchus is the better known animal, with its close fur, webbed feet, and flattened ducklike beak, while its only other near relative, the Echidna, is somewhat similar to the spiny hedgehog in external appearance.
A few minutes after sundown Duckbill appeared, quite unconscious of offence against civilised customs, carrying a waddy with which to administer an anodyne should his capture prove the least refractory. Threats and scoldings were lost. He was incapable of comprehending why there should be a moment's hesitation about the fulfilment of his legitimate rights and demands.
With bated breath, she even suggested that I should make a "death-bone" to be employed for the secret ill of Duckbill; she thus exposed the dross of hereditary superstition which rose to the surface during mental ebullition. It was quite in the nature of things that under stress such a nature should break down.
Her nerves were at acute tension; her life that of a hunted creature; for though she thought her fate inevitable, she concentrated her mind on what seemed to others pitiably weak and inconsequent schemes for the bafflement of Duckbill.
She nestled close to Dan, promising to be his sweetheart on the condition that, rather than that Duckbill should take her away, he would shoot her. If it came about that the dreadful black man was himself driven off or disposed of by some other means and the country made safe for her, then she would marry the man who had saved her, and she hoped that she might never disgrace him.
It is more difficult to identify Monotreme remains, but the fact that Monotremes have survived to this day in Australia, and the resemblance of some of the Mesozoic teeth to those found for a time in the young Duckbill justify us in assuming that a part of the Mesozoic mammals correspond to the modern Monotremes.
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