. Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ... By Richard Lydekker ... Reptiles, Fossil; Amphibians, Fossil. 154 DINOSATJRIA. Suborder THEROPODA. Premaxilla completely toothed; nares, when known (fig. 26) terminal, and a large preorbital vacuity; quadrate elongated, and directed backwards; teeth (fig. 28) simple, laterally compressed, backwardly curved, with serrations on the posterior and frequently on at least a portion of the anterior border, and set in distinct sockets. Yertebrse usually with internal cavities, and frequently Fig. Allosaura
. Catalogue of the fossil Reptilia and Amphibia in the British Museum (Natural history) ... By Richard Lydekker ... Reptiles, Fossil; Amphibians, Fossil. 154 DINOSATJRIA. Suborder THEROPODA. Premaxilla completely toothed; nares, when known (fig. 26) terminal, and a large preorbital vacuity; quadrate elongated, and directed backwards; teeth (fig. 28) simple, laterally compressed, backwardly curved, with serrations on the posterior and frequently on at least a portion of the anterior border, and set in distinct sockets. Yertebrse usually with internal cavities, and frequently Fig. Allosauras fragilis, Marsh.—Leftside of pelvis; from the Upper Jurassic of North America. -^ acetabulum ; il, ilium ; is, ischium; p, pubis. (From the ' Amer. Journ.') lateral pits ; zygosphenal articulations present; cervicals opistho- or amphicoelous, longer or shorter than dorsals, and usually with free ribs; postcervicals amphicoelous; sacral arches usually sup- ported by single vertebrae; in some instances only two sacral vertebra); caudals usually with postzygapophyses; chevrons closed ; rib-facets of middle dorsal vertebrae apparently on the transverse processes. Limb-bones hollow; pectoral limb much shorter than. 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 British Museum (Natural History). Dept. of Geology; Lydekker, Richard, 1849-1915. London, Printed by order of the Trustees
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