. As the research paper which first described the dinosaur species
, this paper is of great scientific and historic significance.
species of dinosaur, and was a large carnivorous dinosaur which lived during the Cretaceous Period. It was one of the last non-
event, which took place around 65 million years ago.
In 1902, the American Museum expedition in Montana, led by Mr. Barnum Brown, and accompanied by Professor R. S. Lull, secured considerable portions of the skeleton of one of the great Carnivorous Dinosaurs of Upper Cretaceous or Laramie age. Additional portions of this skeleton (Amer. Mus. No. 973) are now (1905) being taken out. I propose to make this animal the type of the new genus Tyrannosaurus, in reference to its size, which greatly exceeds that of any carnivorous land animal hitherto described.
I also briefly characterize as Dynamosaurus
another carnivorous dinosaur, with dermal plates, found by Mr. Brown in 1900. The carnivorous group has hitherto been considered as belonging to the single genus Dryptosaurus
, but it is probably little less diversified than its herbivorous contemporaries among the Iguanodontia and Ceratopsia. The generic distinctions which are herein indicated by partially studied remains will probably be intensified by future research. Geological, geographical, and morphological considerations render it a priori
probable not only that the above genera as well as Deinodon
are distinct from Dryptosaurus
but that a fifth Cretaceous genus of somewhat more primitive character, which may be called Albertosaurus
, is represented in the British Columbia skulls hitherto described as Dryptosaurus