. 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] FAUNA OF GASH A TO FORMATION, MONGOLIA 11 Characters.—Molars with high three-cusped trigonid and small low-crested heel. Protoconid highest, paraeonid lowest of the trigonid cusps, metaconid distinct on mi, more prominent on m2. M3 appears to have been as large as m2. P4 small, high, s
. 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] FAUNA OF GASH A TO FORMATION, MONGOLIA 11 Characters.—Molars with high three-cusped trigonid and small low-crested heel. Protoconid highest, paraeonid lowest of the trigonid cusps, metaconid distinct on mi, more prominent on m2. M3 appears to have been as large as m2. P4 small, high, sharp, moderately compressed, with small posterior basal cusp, rudimentary anterior basal cusp, no accessory cusps. Anterior premolars appear to have been rather small, crowded, perhaps reduced, and canine of moderate size for a creodont. Posterior mental foramen beneath p4. Jaw of moderate depth and rather convex inferior Fig. 13. Hyracolestes ermineus, new genus and species. Lower jaw, superior and external views. Type specimen, No. 20425. Four times natural size. This is a primitive type of creodont in many respects, but apparently somewhat speciaHzed in a direction unfamiHar to us, not closely paralleled in the Cernaysian or American Paleocene faunas. It is still less like any Eocene types. The minute size is suggestive of Insectivora, but the dentition is not like any known insectivores. Order Uncertain (?Creodont or Carnivorous Marsupial) Sarcodon pygmseus, new genus and species Type.—No. 20427, an upper molar. Characters.—Molar construction as in certain creodonts and carnivorous marsupials (cf. Limnocyon, Sinopa and related oxyaenid hysenodont genera, also Cladosictis and Amphiproviverra or the modern Thylacinus and Sarcophilus), but with a heavy posterointernal flange like that of mustelid carnassials. Size small, compar- able with Putonus. Protocone large, strongly compressed and extended anteroin- temally, paracone and metacone strongly conna
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