. 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. Fig. SB Fig. 3. Referred skull of Psittacosaurus mongoliensis (Amer. Mus. 6261). Found in the same formation (Oshih) as the type. This skull contains seven maxillary teeth in situ. Skull, one-third natural size. Seven maxillary teeth, natural size. Two of the same teeth are shown in Fig. 3 A
. 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. Fig. SB Fig. 3. Referred skull of Psittacosaurus mongoliensis (Amer. Mus. 6261). Found in the same formation (Oshih) as the type. This skull contains seven maxillary teeth in situ. Skull, one-third natural size. Seven maxillary teeth, natural size. Two of the same teeth are shown in Fig. 3 A enlarged three diameters Fig. 3A. Two superior teeth in referred skull of Psittacosaurus mongoliensis (Amer. Mus. 6261) enlarged three diameters. For comparison with restored tooth of Protiguanodon mongoliense type (Amer. Mus. 6253) enlarged three diameters. Fig. 3B. Type maxillary tooth of Protiguanodon mongoliense (Amer. Mus. 6253) enlarged three diameters; anterior, exterior and interior aspects. After Osborn, 1923, Fig. 5. processes are present, (b) Superior border of ilium not reflected laterally, —an important character separating Psittacosaurus and Protiguanodon from Iguanodon, Trachodon, Troodon. (c) Prepubic process shorter than anterior process of ilium, differentiating Psittacosaurus and Protiguanodon markedly from Iguanodon, Trachodon, Thescelosaurus, Camptosaurus. (d) Ischia much flattened dorsoventrally. (e) Ischia not curved down- ward toward the posterior ends, distinct from Iguanodon, Camptosaurus, Troodon. (f) Postpubic processes short and slender,—probably a reduction character. The Psittacosaurus mongoliensis Skeleton Skull.—The perfectly preserved skull was described and figured in great detail in the type description^ in which the skull characters are ^Op. cit , pp. 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 no
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