Introduction And Succession of Vertebrate Life in America An Address Delivered
Introduction And Succession of Vertebrate Life in America An Address Delivered
Othniel Charles Marsh
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The Artiodactyles, or even-toed Ungulates, are the most abundant of the larger mammals now living; and the group 36 dates back at least to the lowest Eocene. Of the two well marked divisions of this order, the Bunodonts and the Seleno- donts, as happily defined by Kowalevsky, the former is the older type, which must have separated from the Perissodactyle line after the latter had become differentiated from the prim- itive Ungulate. In the Coryphodon Beds of New Mexico, occurs the oldest Artioda...ctyle yet found, but it is at present known only from fragmentary specimens. These remains are clearly Suilline in character, and belong to the genus EoJiyus. In the beds above, and possibly even in the same horizon, the genus Helohyus is not uncommon, and several species are known. The molar teeth of this genus are very similar to those of the Eocene Hyracotherium, of Europe, which is sup- posed to be a Perissodactyle, while Helohyus certainly is not, but apparently a true lineal ancestor of the existing pigs.
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