Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 Pig. 117.—Bones of the feet of the different genera of the EquUltF (after Marsh), a, Foot of Orohipput (Eocene). 6, Foot of Anchitkerium (Lower Miocene), c. Foot of Uipparion (Pleiocene). d, Foot of the recent genus Eguus. In addition to these works we have the recent researches of Marsh, who has completed to an extraordinary degree our knowledge of the genealogy of the genus , by numerous discoveries (fig. 117) in America {Wyomin
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 Pig. 117.—Bones of the feet of the different genera of the EquUltF (after Marsh), a, Foot of Orohipput (Eocene). 6, Foot of Anchitkerium (Lower Miocene), c. Foot of Uipparion (Pleiocene). d, Foot of the recent genus Eguus. In addition to these works we have the recent researches of Marsh, who has completed to an extraordinary degree our knowledge of the genealogy of the genus , by numerous discoveries (fig. 117) in America {Wyoming, Green River, White River). The eocene Oroliippus, in which the small posterior toes were present as well as the three principal toes which rested on the ground, was succeeded in the Lower Miocene formation by Anchitkerium with three hoofs; and the latter was followed by the Hipparion of the Pleiocene formations; and this is the ancestral form of the existing genus Equus. The origin of most orders of Mammalia, such as Rodentia, Cheirop- tera, Proboscidea, Cetacea, etc., cannot be clearly traced out, but for ce-tain orders, as the Prosimice, Carnivora, Ungulata, and Ro-
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