Title: The age of mammals in Europe, Asia and North America
Identifier: ageofmammalsineu00osbo (find matches)
Year: 1910 (1910s)
Authors: Osborn, Henry Fairfield, 1857-1935
Subjects: Mammals, Fossil; Paleontology
Publisher: New York, The Macmillan Company
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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156 THE AGE OF MAMMALS tomorphidae, Notharctidae), both surviving from the Lower Eocene. The pro-Carnivora (Miacidae) also survive from the Lower Eocene, and be- come more diversified than in the Wind River, although most of the genera are modified Lower Eocene forms. The Rodentia still are limited to the rather generalized Ischyromyidae, also surviving from the Lower Eocene and becoming diversified into six genera, which may prove to represent more than one family. At the very summit of the Eocene the American rodents known as jumping mice, or Dipodidae, are doubtfully represented in the genus Protoptychus. Among the modern ungu- lates, as in Europe, this is the grand epoch of the Peris- sodactyla. Of these, two families only (Equidae and Lophiodontidae) have relatives in Europe. Of the re- maining families, the tapirs (Tapiridae), titanotheres (Titanotheriidae), two families of rhinoceroses (Hyraco- dontidae, Amynodontidae), cursorial, aquatic, or amphib- ious respectively, appear to be peculiar to North America. The even-toed ungulates, or Artiodactyla, are far less diversified than in Europe. They include the bunodont and omnivorous Achaenodontinae (Achcenodon), related to the entelodonts Characteristic Mammals Uintatheres Horses Tapirs Rhinoceroses Titanotheres Lophiodonts Entelodonts Homacodonts Oreodonts Camelids Taeniodonts Tillodonts Insectivores Lemuroids Armadillos
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Fig. 57. —In tlic li,.:irt <,l'th.'Middle Eocene, Bndgcr liadl;uid.s <il W \ nimnt^, ii. tli.'fani.nis locality known as Grizzly Buttes. Zone of Orohippus and Palwosyops. Photograph by American Museum of Natural History, 1903.

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