. The Ceratopsia. Ceratopsia. portions of the skulls of the first two of these species were given, and also a figure of the parietal of M. crassus, which had previously been described by Cope first as an episternal and later figured and described by him as a ; REMAINS OF CERATOPSIA DISCOVERED BY CANNON, EEDRIDGE, AND CROSS. In 1887b Marsh described and figured a pair of horn cores discovered by Mr. George L. Cannon in the light-colored sandstones of the Denver beds on Green Mountain Creek, near Denver, Colo. These remains were at first referred by Professor Marsh to the bisons and
. The Ceratopsia. Ceratopsia. portions of the skulls of the first two of these species were given, and also a figure of the parietal of M. crassus, which had previously been described by Cope first as an episternal and later figured and described by him as a ; REMAINS OF CERATOPSIA DISCOVERED BY CANNON, EEDRIDGE, AND CROSS. In 1887b Marsh described and figured a pair of horn cores discovered by Mr. George L. Cannon in the light-colored sandstones of the Denver beds on Green Mountain Creek, near Denver, Colo. These remains were at first referred by Professor Marsh to the bisons and described under the name of Bison alticornis, and on this evidence alone the deposits were determined by him to be more recent than the Equus beds (now universally considered Pleisto- cene), and probably late Pliocene. It is now well known that Professor Marsh erred in referring these remains to the bisons, and that they are in reality the supraorbital horn cores of one of the larger Ceratopsia. Nor is Professor Marsh's error to be wondered at, but on the other hand it is quite excusable, since at that time nothing was known regarding the structure of the skulls of these strange dinosaurs, and, in size, surface markings, and form these horn cores more nearly resembled those of certain extinct bisons than of any other known animals, while the very imperfectly petrified nature of the remains might very readily be taken as indicative of the Pliocene or Pleistocene age of the deposits. Indeed, this mistaken identification is a striking ex- ample to show how occasionally one may the more readily be led into error through a complete familiarity with his subject, for all that was then known of comparative osteology, as well as the superficial structure and general character of the remains indicated that these horn cores pertained to a very large extinct bison. Had the remains fallen into the hands of any other vertebrate paleontologist prob- ably the same error would have been made,
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