. 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 [No. 101 Simplicidentata (Glires, sensu stricto) Tsaganomys altaicus, new genus and species Cyclomylus lohensis, new genus and species ? Prosciurus lohiculus, new species Cricetops dormitor, new genus and species Tataromys plicidens, new genus and species Tataromys
. 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 [No. 101 Simplicidentata (Glires, sensu stricto) Tsaganomys altaicus, new genus and species Cyclomylus lohensis, new genus and species ? Prosciurus lohiculus, new species Cricetops dormitor, new genus and species Tataromys plicidens, new genus and species Tataromys signiodon, new species Karakoromys decessus, new genus and species Selenomys mimicus, new genus and species Eumys asiaticus, new species Duplicidentata (Lagomorpha) Desmatolagus gobiensis, new genus and species Desmatolagus robustus, new species The first two genera are the subject of this paper; the remaining rodents of this fauna will be described in the next 190/9 Fig. 1. Tsaganomys altaicus, skull and jaws, side view, natural size. No. 19019, type specimen, characters partly supplemented from Nos. 19021, 19030 and 19033. Bathyergidse Tsaganomys altaicus, new genus and species Type.—Amer. Mus. No. 19019, skull and lower jaws. Paratypes.—Nos. 19020, 19029, 19030, 19033, 19037, 19038, skulls, some with lower jaws associated. Horizon and Locality.—Oligocene, Hsanda Gol formation, red strata, Loh, Tsagan Nor basin, outer Mongolia. Diagnosis.—Skull short, wide, robust, the occiput very broad and pitched heavily forward with prominent occipital and sagittal crests. Infraorbital foramen. 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, 1871-1930. [New York : American Museum of Natural His
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