Albertosaurus, Osborn, 1905

W. D. Matthew & Barnum Brown, 1923, Preliminary notices of skeletons and skulls of Deinodontidae from the Cretaceous of Alberta, American Museum Novitates 89, pp. 1-10 : 9

6.- Albertosaurus . Skull, hind limb, and tail. Topotypes of A. sarcophagus .

To this genus are provisionally referred a large series of partly associated bones, representing several individ-uals, found together in a quarry in the Edmonton beds by the expedition of 1911 . They were the first specimens to show clearly the construction of the deinodont pes, demonstrating its ornithomimid type and showing that the large species referred to Ornithomimus by Marsh were really of this group. (Owing to the incompleteness of the median metatarsal this fact was not shown by the Tyrannosaurus skeleton found in 1903.) The skull, hind limb, and tail have been prepared and placed on exhibition, but the two latter are temporarily withdrawn.

The material here shown does not demonstrate any valid generic distinctions of the genus Albertosaurus , which has never been differentiated from Deinodon or Gorgosaurus . The extreme reduction of the premaxillIe may, however, be a generic character. It is, at all events, a marked distinction from the large Gorgosaurus , although less clearly so from G. sternbergi . Detailed comparisons may show other and more certainly valid distinctions