. 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. 1925] NEW UNGULATES FROM MONGOLIA although congeneric only in a broadly inclusive sense. We are unable to agree with Peterson that Desmatotherium should be removed from the Helaletidae to the Hyracodontidae, but a general discussion of the affini- ties of this group of lophiodonts may better
. 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. 1925] NEW UNGULATES FROM MONGOLIA although congeneric only in a broadly inclusive sense. We are unable to agree with Peterson that Desmatotherium should be removed from the Helaletidae to the Hyracodontidae, but a general discussion of the affini- ties of this group of lophiodonts may better be postponed until the Irdin Manha material is more fully described. Among the European genera, Chasmotherium comes nearest in molar structure, but the pre- molars and anterior teeth differ widely. Lophiodon differs in the molar construction, as pointed out by Stehlin and Deperet, and is decidedly. 20358 Fig. 6. Ardynia prsecox Matthew and Granger, lower jaw with premolar and molar dentition, crown and outer views, natural size. No. 20358, Ardyn Obo formation. more primitive in its premolars. Both Desmatotherium mongoUcum and Paracolodon curtus had apparently the same peculiar recession of the narial notch that is seen in skulls of Helaletes collected by one of us in 1904, and has been observed by Peterson, 1919, and Troxell, 1922, in the type of this genus. The character is not known in the remaining species of this group, but may well have been distinctive of all of them, and would separate them from Lophiodon, Chasmotherium and Hyrachyus, as well as from Systemodon and Isectolophus. The beginnings of this recession are doubtfully seen in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Central Asiatic Expeditions (1921-1930); Andrews, Roy Chapman, 1884-1960; Matthew, William Diller, 1871-1
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