98 Report of the President 



The studies upon the Sauropodous Dinosaurs were continued 

 by Professor Osborn and assistants, and a memoir upon the 

 skeleton and adaptations of the genus Camarasaurus Cope by 

 Professor Osborn and Doctor Mook was completed and pub- 

 lished. 



Professor H. Matsumoto of the Imperial College of Science, 

 Tokio, Japan, continued his researches upon the Fayum fauna 

 of Egypt and completed revisions of the Palceomastodon and 

 Hyracoid groups, which will be published by the American 

 Museum. 



Mr. Frick was engaged during the year in a very thorough 

 monographic research upon the valuable collections which he has 

 obtained from the Eden formation in California. The prepara- 

 tion of this collection was continued through the year by two 

 assistants and the illustration of the material by an artist, the 

 expenses of this work being defrayed by a special fund of his 

 providing. The fauna is of unusual interest as representing a 

 Pliocene stage in the evolution of American Tertiary mammals 

 that has hitherto been very imperfectly known, and the research 

 has resulted in the discovery of many new forms and the recog- 

 nition of new or little known stages in the evolution of various 

 phyla. 



Doctor Matthew continued research work upon the Paleocene 

 mammals, and published four preliminary notices, two in the 

 American Museum Novitates, one in Science, one in The Amer- 

 ican Journal of Science, describing a number of new genera, and 

 dealing with the stratigraphic relations and correlation of the 

 Paleocene faunas. He also prepared a preliminary notice upon 

 the taxonomy of the group of Carnivorous Dinosaurs, with 

 description of a new genus, as a joint contribution with Mr. 

 Barnum Brown; revised the Snake Creek fossil mammal collec- 

 tion of 1918 and a part of the collection of 1921, and contrib- 

 uted a number of articles to Natural History. 



Doctor Gregory continued his researches upon comparative 

 anatomy of the vertebrates and especially upon the evolution of 

 the human dentition, up to the time of his transfer to a separate 

 Department of Comparative Anatomy. His report of work 

 for 1921 will be found elsewhere. 



Miss Marjorie O'Connell continued through the year her re- 

 searches upon the Jurassic fauna of Cuba, based chiefly upon 



