Herbivora , (plant-eaters), an order of mammals, ungulate or hoofed, having molar teeth for grinding, and no clavicles. Owen divides them into: 1. Artiodactyls, or even-toed, with 19 dorso-lumbar vertebras, and horns, if any, in pairs; including ruminants, two-toed, which chew the cud, as the cow, sheep, and camel; and omnivores, four-toed, like the hog. 2. Pe-rissodactyls, odd-toed, one, three, or five, with more than 19 dorso-lumbar vertebra), and horns, when any, never in pairs; including the solid-ungulates or solid-hoofed, one-toed, like the horse, ass, and hipparion; multungulates, three or five-toed, like the tapir, rhinoceros, and palosotherium; and proboscidia, like the elephant and mastodon, with five toes, a proboscis, and tusks in one or both jaws. They form one of the three orders of the eighth class, or mammals, in Prof. Agassiz's classification, the other two being marsupials and carnivora; of course, thus including rodents, many edentates, bats, and monkeys. This extension of the term is likely to introduce confusion into the generally followed classifications.