Diplarthra

Order of Eutheria with non-deciduate placenta. See ADECIDUATA. Usually known as Ungulata in a restricted sense. They form two groups, the Odd-toed ( Per is so dactyl a) and the Even-toed ( Artiodactyl a ). The inside toe is always wanting, except in Coryphodon, which has all the mammalian digits and is therefore by some placed in a separate suborder ( Teleodactyla ). The nail on the tip of the toes is developed into a hoof. Cla vicles are absent. There are two sets of teeth (diphyodont): the molars have broad, grinding crowns. All are herbivorous and have been designated the Herbivora, and by some authorities divided into Uni ungulates, Biungulates, Mul tiungulates, etc., according to the number of hoofs: with these groups were included the Proboscidea and Hyracoidea. They were also known as Pachyderm at a or thick-skinned animals.