78 BEPORT OF NATIONAL MUSEUM, 1913. 



specimens, representing 22 recognizable genera and a slightly greater 

 number of species, several of which are new to science. Mr. Copley 

 Amory, jr., of Columbia University, while serving as a collaborator 

 of the Museum, obtained some 30 fragmentary fossil mammal bones 

 from the Old Crow River, Yukon Territory, about 100 miles north 

 of the Ai'ctic Circle, one of which is a phalanx or toe bone of a species 

 of large camel, the first evidence of the former occurrence of this 

 animal north of the United States. A nearly complete skull of a 

 fossil horse, which had been described by Dr. O. P. Hay, and a tooth 

 of a mastodon were received as a loan from Mr. C. P. Snyder, of 

 Tofty, Alaska. A miscellaneous collection of fossil mammahan 

 remains from the Miocene deposits of the shores of Chesapeake Bay 

 in the vicinity of Chesapeake Beach, Md., was presented by Mr. 

 Wilham Palmer and Mr. A. C. Weed, of the Museum staff. 



By the employment of temporary help an exceptional amount of 

 preparatory work was accomplished, probably more than in any pre- 

 vious year. Attention was mainly directed to certain miscellaneous 

 material belonging to the Marsh collection, consisting of fragmentary 

 vertebrate remains still embedded in the matrix as received from 

 the field a number of years ago. This material fills several hundred 

 boxes and trays, of wliich the contents of 46 boxes and 150 trays were 

 cleaned up and the bones assembled for each individual specimen 

 represented. Several new and unexpected finds resulted, including 

 many complete ribs of Teleoceras, a number of skulls and jaws of the large 

 creodont MerycocTicerus and of rare carnivores from the John Day and 

 Miocene beds of Nebraska, and a new genus and species of dinosaur 

 from the Lance formation of Wyoming which has been described by 

 Mr. Gilmore under the name Thescelosaurus neglectus. The last 

 mentioned is represented by a nearly complete skeleton, which seems 

 to have been entirely overlooked by Prof. O. C. Marsh, under whose 

 direction the material was collected. Much was also done toward 

 cleaning the specimens from the cave in Cumberland, Md., received 

 during the year. Other work turned out by the preparators com- 

 prised a free mount of the small two-horned rhinoceros, Diceratherium, 

 a reUef mount of the dinosaur Stegosaurus stenops, mounts of a large 

 hind limb of Brontosaurus and of a considerable number of small 

 batrachians and reptiles, and remounts of a skeleton of Hesperomis 

 regalis and of a cast of Pareiasaurus haini. The type specimen of 

 Hoplitosaurus marshi was cleaned, good progress was made on a free 

 mount of a skeleton of Stegosaurus, of which genus some 100 separate 

 bones of other individuals were prepared for the reserve series, and 

 work on a nearly complete tail of a large bipedal dinosaur, Trachodon, 

 was well under way. 



Mr. Charles W. Gilmore, assistant curator of fossil reptiles, de- 

 scribed the new dinosaur from the Lance formation of Wyoming 



