. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. AMERICAN MUSEUM NOVITATES Published by -mnr Number 195 theAmerican museum of natural history Nov. 19, 1925 New York City ,6(1181) NEW UNGULATES FROM THE ARDYN OBO FORMATION OF MONGOLIA! WITH FAUNAL LIST AND REMARKS ON CORRELATION By W. D. Matthew and Walter Granger In a preceding ar
. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. AMERICAN MUSEUM NOVITATES Published by -mnr Number 195 theAmerican museum of natural history Nov. 19, 1925 New York City ,6(1181) NEW UNGULATES FROM THE ARDYN OBO FORMATION OF MONGOLIA! WITH FAUNAL LIST AND REMARKS ON CORRELATION By W. D. Matthew and Walter Granger In a preceding article^ we described two creodonts and three rodents from the Ardyn Obo formation, collected in 1923 by the Third Asiatic Expedition. The ungulate remains from this horizon include skulls of an amynodont rhinoceros already described by Professor Osborn and a complete titanothere which he will describe in a forthcoming number of Novitates. The smaller and more fragmentary ungulate material, in- cluding four perissodactyls and three traguloid ruminants, is described in the following pages. Perissodactyla Schizotherium avitum Matthew and Granger, 1923 This species is based on a last lower molar. No. 20384, a poorly preserved piece of the lower jaw with p2 and , probably represents the same species. The second premolar is unworn and only partly emerged. It has a compressed protocone with sharp and prominent anterior and posterior ridges, the anterior curving around to the antero-internal corner of the tooth, the posterior extending back to become continuous with the sharp-crested, nearly median heel. There is a small, low-set, but quite sharply de- fined little cusp on the inner face of the tooth, a little above the base and posterior to the point of the protocone. It occupies about the position one would expect for a rudimentary metastylid, corresponding substantially in its relations to the base of the metastylid of the molars. We have not found this 'Publications of the As
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