. 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. 1924] ANDREWSARCHUS OF MONGOLIA Zygomatic width across occipital condyles. Faciocranial index Cephalic, or breadth-length index Harpagolestes uintensis 71 mm. 92% 63% MESONYX Andrewsarchus mongoUensis 117 mm. 150% 67% WOLF. ANDREWSARCHLiS MONqOLIENSIS ( ALL TO THE same: SCALE ) Fig. 2. Compa
. 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. 1924] ANDREWSARCHUS OF MONGOLIA Zygomatic width across occipital condyles. Faciocranial index Cephalic, or breadth-length index Harpagolestes uintensis 71 mm. 92% 63% MESONYX Andrewsarchus mongoUensis 117 mm. 150% 67% WOLF. ANDREWSARCHLiS MONqOLIENSIS ( ALL TO THE same: SCALE ) Fig. 2. Comparison of Andrewsarchus with Mesonyx, Ursus and Canis. Type cranium of Andrewsarchus mongoUensis (Amer. Mus. 20135). Palatal and superior views. All figures one-tenth natural size. Cranium of Mesonyx obtusidens (Amer. Mus. 12643). Cranium of Alaskan Brown Bear (Ursus gyas) (Amer. Mus. 21802). Cranium of Wolf (Canis occidentalis) (Amer. Mus. 31624). Dental Characters.—Type characters of A. mongoUensis which may prove to be of generic or specific value are the following (Figs. 1,2):- I^ greatlj^ enlarged; i' much smaller. Canines, superior, not preserved, of enormous size. P' small, with single fang and cone. P' bifanged, with .single cone; ap. 46 mm., tr. 21 mm. P^ with rudimentary third fang, double cone, prominent protocone, no deutero- cone; ap. 59 mm., tr. 37 mm. P'' enlarged, molariform, with prominent tritocone, three fangs; ap. 51 mm., tr. 43 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 History
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