. Les Ceratopsia. Ceratopsia. i ! Fig. 1.-Vue latérale de type de don- rnirabilis Tracho Leidy. La taille naturelle. Après l'Leidv.. Fig. 2.-Vue latérale de la dent de mono- clonius, un dinosaure à cornes- ment la découverte par le docteur Hayden. Deux fois la taille naturelle. Après Leidy. Découverte DE TYPE D'AGATHAITMAS SYLVESTRIS PAR PROF. F. B. MEEK. Dix-sept ans après le docteur Hayden's explorations dans la Judith River country, ou en 1872, le professeur F. B. Meek a découvert une partie du squelette d'un membre de l'Ceratopsia près de Black Buttes station sur l'Union Pacific Railroad, non loin de l'Hallville des mines de charbon, 52 miles

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. The Ceratopsia. Ceratopsia. i ! Fig. 1.—Lateral view of type of Tracho- don rnirabilis Leidy. Natural size. After Leidv.. Fig. 2.—Lateral view of tooth of Mono- clonius, a horned dinosaur discov- ered by Doctor Hayden. Twice natural size. After Leidy. DISCOVERY OF TYPE OF AGATHAITMAS SYLVESTRIS BY PROF. F. B. MEEK. Seventeen years after Doctor Hayden's explorations in the Judith River country, or in 1872, Prof. F. B. Meek discovered a portion of the skeleton of a member of the Ceratopsia near Black Buttes station on the Union Pacific Railroad, not far from the Hallville coal mines, 52 miles east of Green River. The locality was visited the same year by Prof. E. D. Cope, who succeeded in recovering "sixteen vertebrae, including a complete sacrum, caudals, and dorsals, both«ilia and other pelvic bones, bones of the limbs, ribs, etc." These were described by Cope 6 and constitute the type of the genus and species Agathaumas sylvestris. In his original descrip- tion he says some limb bones were recovered. In a later publication, 0 however, he says, "There are no bones certainly referable to the limb bones." This material is at present preserved in the collections of the American Museum of Natural History (No. 4000) and consisted originally, according to Cope, of "sixteen vertebras, including a perfect sacrum, with dorsals and caudals; both ilia and other pelvic bones, those of one side nearly perfect; some bones of the limbs, ribs, and other parts not determined." Of this material there has been accessible to me only the right ilium and a mere fragment of the anterior extremity of the left, one rib nearly com- plete, and a proximal portion of a second. The sacrum and the dorsals, caudals, and sacro- caudals figured by Cope are also available, although some of the neural arches and spines of the dorsals are missing. o Extinct Vertebrata from the Judith River and Great Lignite formations of Nebraska: Trans. Am. Philos.Soc, 2d ser., vol.

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