Annotated catalogue of the dinosaurs (Reptilia, Archosauria) in the collections of Carnegie Museum of Natural History Author John S. McIntosh Research Associate, Section of Vertebrate Fossils; Department of Physics, Wesleyan University, Middletown, Connecticut 06457 text Bulletin of Carnegie Museum of Natural History 1981 1981-10-16 18 1 67 journal article http://doi.org/10.5281/zenodo.3943059 1aa43d9b-a9da-41f9-b4a3-70b84c3cc978 3943059 Family Megalosauridae Genus Allosaurus Marsh, 1877 Syn.: (? ) Antrodemus Leidy, 1870 . Although it is not unlikely that the half caudal centrum upon which Leidy founded Antrodemus belongs to this animal, the realization in recent years that a number of large theropods were present in the Morrison Formation makes positive verification of the synonymy difficult. Most writers today have returned to the use of the name Allosaurusthe position adopted here.