Abstract
1. Introduction.—Through the adventurous journeys of John Gould, F. R. S., in the wilds of Australia, and by the noble works in which he has given the results of his zoological observations in that continent and the adjoining island of Tasmania, we mainly know the extent and kinds of variation under which the Kangaroos there exist. The present communication gives part of the researches into the forms of those saltatory herbivorous Marsupials which have passed away, or, at least, are known to naturalists only by their fossil remains. I shall be happy if I am able to complete a work which may be regarded as worthy to rank as a supplement to that of my old and esteemed friend and fellow labourer.

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