Description of new dinosaurian reptiles Author Marsh, O. C. text American Journal of Science 1890 1890-01-31 39 229 81 87 journal article 10.5281/zenodo.3375239 9bae3d9b-2f03-42ee-9a8e-ac6d8a61f7e6 3375239 2B442B66-390A-4217-A502-276BD9BEDB55 A third species, much larger, may be called Ornithomimus grandis. The third metatarsal was about 600mm. in length, and its distal end 90mm. in transverse diameter, and 80mm, in antero-posterior diameter.