ALL readers of the American Naturalist must be familiar with a striking woodcut of the entire skeleton of a peculiar fossil Ungulate, which occurs throughout a long series of numbers among the ...

IN his article on Phenacodus primævus in NATURE of May 16 (p. 57), Mr. Lydekker expresses his disbelief in my opinion that that animal is nearly related to the immediate ancestor of the line of the ...

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This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's ...