A History of Land Mammals in the Western HemisphereMacmillan, 1937 - 786 pages |
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ancestor antelopes antlers armadillos artiodactyls Asia bones Bridger brontotheres camels carnivores Casa Mayor cats characteristic claws co-ossified continent cranium crests cusps deer dentition Deseado digits elephants elongate enamel Eocene extinct fauna fibula foreodonts fossils genera genus grinding teeth ground-sloths Hemisphere hoofed animals horns horses humerus hypsodont incisors John Day known larger later less Litopterna low-crowned lower jaw lower Miocene lower molars mammalian mammals manus marsupials Merycoidodon middle Miocene Miocene modern molars nasal nearly neck Neotropical North America Notoungulata Old World Oligocene pair Paleocene Pampean peccaries perissodactyls permission of N. Y. phalanges Pleistocene Plio Pliocene posterior premolars primitive proboscideans Pyrotheria region relatively resemblance rhinoceroses sagittal crest Santa Cruz shape short skeleton skull slender smaller South species stage subfamily suborder tail tapirs Tertiary tooth Toxodon transverse tusks Uinta ulna ungual upper canine upper Miocene upper molars vertebræ White River