62 REPORT OF NATIONAL MUSEUM, 1918. 



of its kind in existence at the present time. As a source of exhibi- 

 tion, study, and exchange material, it will prove a valuable asset. 

 Careful selection has been made of the specimens best suited for each 

 purpose, and the entire collection stored systematically. 



Good progress was made early in the fiscal year on the prepar- 

 ation of material for mounting a skeleton of one of the large 

 Titanotheres, a work which was, however, temporarily laid aside in 

 order that the services of the preparators could be devoted to the 

 more pressing work on the Dimetrodon mount. For the same reason, 

 progress on the Cumberland cave collection has necessarily been slow, 

 but Mr. James W. Gidley has personally continued work on the Fort 

 Union mammals, especially as to determination, classification, and ar- 

 rangement. 



Mr. Gilmore prepared for publication a short paper on the newly 

 mounted skeleton of the armored dinosaur, Stegosaurus stenops, and 

 one on the osteology of Trlceratops with special reference to the 

 brain case. He also completed a description of a fine series of turtle 

 and dinosaur remains from New Mexico, which now only awaits the 

 finishing of the illustrations to be forwarded for publication as a 

 Professional Paper of the United States Geological Survey. While 

 work has progressed on his monographic study of the carnivorous 

 dinosaur material in the Museum collections it was not completed, 

 as was the expectation last year. A paper describing the Dimetrodon 

 gigas skeleton is under way. 



Mr. Gidley has continued his joint work with Mr. Gerrit S. Miller, 

 jr., on the revision of the Eodentia, living and extinct. A sjoiopsis 

 of the work, which will appear as a preliminary publication, and 

 their investigations on some of the special problems, have been com- 

 pleted. Mr. Gidley's Claenodont paper has been entirely revised and 

 its value very materially increased by the important problems dis- 

 cussed. Descriptions of two new species, representing a new genus of 

 extinct peccary, based on material from the Cumberland cave deposit, 

 are nearly completed. 



In connection with the collections of Cretaceous invertebrates, a 

 large number of fossil fish scales has gradually been assembled. Dr. 

 T. D. A. Cockerell took up the study of those from western States, 

 and an illustrated paper has been prepared for publication by the 

 United States Geological Survey. 



Dr. O. P. Hay, under a grant from the Carnegie Institution, has 

 continued his studies of Pleistocene vertebrate material; and Dr. J. 

 L. Wortman has studied the Museum collections in connection with 

 some important investigations he is making relative to the fossil 

 primates of the Bridger Eocene and their possible relationship to the 

 South American monkeys. 



