. 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. 8 AMERICAN MUSEUM NOVITATES [No. 198 should be referred to Choeropotamidse.^ The American genera are very imperfectly known at present, and no distinctively suilline or anthra- cothere characters appear in the parts described, so that it seems better to retain the family for the present, pen
. 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. 8 AMERICAN MUSEUM NOVITATES [No. 198 should be referred to Choeropotamidse.^ The American genera are very imperfectly known at present, and no distinctively suilline or anthra- cothere characters appear in the parts described, so that it seems better to retain the family for the present, pending determination of its real affinities. Near relationship between Gobiohyus and Helohyus is in- dicated by the close resemblance throughout of the molars and premolars, apart from the more progressive character of the latter (indicated in p4, inferred in upper premolars), a difference to be expected in an Upper Eocene genus compared with its Middle Eocene relatives. It should also be observed that Stehlin's interpretation of the anterior teeth in Chceropotamus would exclude it from any typical position in the common ancestral stock of Suidae and Anthracotheriidse. The Helohyidse may likewise prove to belong rather with the dichobunids than with the choeropotamids, in spite of the absence of hj-pocone. AM 20250. Fig. 8 Fig. 9 Fig. 8. Gobiohyus orientalis. Upper jaw, type specimen. No. 20249, natural size, external and crown views. Fig. 9. Gobiohyus orientalis. Lower jaw, No. 20250, natural size, crown and external views. Gobiohyus orientalis, new species Type.—No. 20249, upper jaw with p^-m^. Paratypes: No. 20248, lower jaw, mi-3, and two upper molars probabh^ accidentally associated; No. 20250, lower jaw, p^-ms. All from Irdin Manha formation. Species Characters.—P^-m^ = 50; m^-^' = ; mi-3 = 30; m2-3 = 22. Lower molar teeth more robust, trigonid of ms wider and heel smaller; ms length width = L56 'Stehlin, , 1906, however, regards Helohyus as m
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