. 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. 1929] THE FAUNA OF THE GASHATO FORMATION Known upper cheek teeth (paratype), probably M'-^, strongly transverse, with short, crescentic protocone; conical, high paracone and metacone, bases connate; distinct parastyle, smaller metastyle, narrow anterior cingulum; well marked, basined, non-cu
. 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. 1929] THE FAUNA OF THE GASHATO FORMATION Known upper cheek teeth (paratype), probably M'-^, strongly transverse, with short, crescentic protocone; conical, high paracone and metacone, bases connate; distinct parastyle, smaller metastyle, narrow anterior cingulum; well marked, basined, non-cuspidate posterior cingulum rising to protocone. P* (part of alveolus) probably wider than M'. M^ slightly larger and more transverse than M'. M^ (alveoli) as large as M^ or larger. Despite its large size, this genus is suggestive of the Leptictidse, although this resemblance is not sufficiently close necessarily to indicate true relationship. The molarization of the premolars has gone farther than in any leptictid, the bilophodont lower molars are not very closely paralleled in that group; the cheek teeth of the latter do not increase in size posteriorly as in Pseudidops, and their upper molars always have a hypo- cone which does not closely correspond to the posterior cingulum of Pseudidops in its relationship to the protocone. The Cretaceous Zalambdalestes from an earlier formation near the same locality is leptictid in aspect and to that extent resembles Pseudidops, but there are no indications of special affinity. The complication of the premolars, lophiodont lower molars, reduced para- conids, short heels on Mi-2, and reten- tion of triangular upper molars recalls. 21712 Paratype Fig. 3. Pseudidops lophiodon; new genus and species. Part of right upper jaw with two cheek teeth. Para- type. A, external view. B, crown view. the Amblypoda, but the resemblance is Three times natural size. even less close than to the Leptictidse. Eurymylidae, new family Provisional Definitio
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