2. Struthiomimus tenuis .

The type of the geologically more ancient " Ornithomimus” tenuis 4 Marsh bears the catalogue number U. S. Nat. Mus. 5814 . It is of Monoclonius-Ceratops zone age, from the Judith River formation as exposed on Birch Creek, Montana, and was collected by J. B. Hatcher in 1888. Hatcher state’s 5 that he found Marsh’s type of this species, consisting of a foot and a portion of a limb, on Cow Island, Missouri River, at a level which he estimates from 1,500 to 1,600 feet below the summit of the Judith River beds and 500 to 600 feet below the level of Marsh’s type of Ceratops montanus .