. 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] SA UROPODA AND THEROPODA OF MONGOLIA 3 Generic Characters.—Asiatosaurus, derived from the Greek 'Acria, Asia, and aavpa, lizard. Type: (?Posterior) maxillary or dentary tooth, small, concavo- convex; subspatulate crown, slightly expanding superiorly; two lateral external and one median
. 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] SA UROPODA AND THEROPODA OF MONGOLIA 3 Generic Characters.—Asiatosaurus, derived from the Greek 'Acria, Asia, and aavpa, lizard. Type: (?Posterior) maxillary or dentary tooth, small, concavo- convex; subspatulate crown, slightly expanding superiorly; two lateral external and one median internal vertical grooves. Paratype: (?Anterior) enlarged tooth with transverse equaling anteroposterior (ap. 126 diameter) diameter of fang, expanded summit, convexo-concave (internal section), shallow lateral and internal vertical grooves. Type Description.—(1) The type tooth (Fig. 2) measures 41 mm. in height as preserved, 47 mm. in circumference, mm. in anteroposterior cUrection (, parallel with the direction of the tooth-row) and mm. perpendicular to this direc- tion; the external surface is convex in both vertical and horizontal directions; near. Tiat. sije A. 6294 paratype: Fig. 3. Paratype of Asiatosaurus mongoliensis (Amer. Mus. 6294). Supposed to be an anterior tooth of the dentary. Natural size. each edge is a broad, shallow vertical groove. (2) The internal surface is flat at the base, but concave in both vertical and horizontal directions near the apex of the crown. The surface therefore roughly resembles the inner or upper surface of a spoon. A small median groove extends vertically through the base of the bowlshaped depres- sion. (3) The edges are straight and parallel near the base of the tooth, but near the crown are beveled by worn surfaces; the latter are asymmetric in development, one being rather convex in profile and extending down only 15 mm. from the apex, while the other is concave and extends downward about 30 mm. The two
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