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Nature volume 127, page 369 (07 March 1931) | Download Citation



THIS work forms a companion volume to the same author?s monograph on the European Mesozoic mammals which was published in 1928 as a catalogue by the Trustees of the British Museum. In the present volume the author has rounded off his investigations by a description of the pre-Tertiary mammals of the American continent. While there are here no faunas at present known quite so early as the Rhtic and Middle Jurassic of the Old World, there are, on the other hand, at least a few places where Cretaceous mammal remains occur. A knowledge of what happened in this period is so essential to our understanding of the evolution of placental and marsupial lines, and the localities and their yield of specimens so scarce that the dozen genera of marsupials and three of placentals here catalogued by Dr. Simpson acquire considerable importance.

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