7 2 Report of the President 



delicate structures of the skull in Eocene lemuroids. This 

 work, executed under a microscope, has added materially to 

 the evidence regarding the evolution of the Primates. 



A number of new or little-known specimens from the 

 Eocene and Paleocene formations have been prepared, chiefly 

 for the study collections. 



Considerable progress has been made in the reinstallation 

 of the exhibits in the Tertiary Mammal Hall; the Amblypoda, 

 Carnivora and Creodonta, Oreodontidse and Ruminantia 

 alcoves are partly arranged and several additions have been 

 made to the skulls and skeletons therein displayed. A skeleton 

 and several skulls of Moropus and skeletons of the Sabre- 

 tooth Tiger and Extinct Wolf have been temporarily placed 

 on exhibition pending an opportunity to mount them for per- 

 manent exhibits. 



A skeleton of the Cuban Ground Sloth Megalocnus has been 

 mounted for our exhibition series and a second skeleton of the 

 same animal is now being mounted, destined for the Academy 

 of Natural Sciences in Havana, in accord with the arrange- 

 ments made through Dr. de la Torre for the division of the re- 

 markable collection of Cuban fossil mammals obtained under 

 the joint auspices of the two institutions. 



An exhibit illustrating the most recent discoveries and 

 remains pertaining to primitive man, his appearance, habits 

 and ancestry has been arranged in the Hall of Fossil Mammals 

 and has attracted great interest. The nucleus of this collec- 

 tion is a series of casts of the more important skulls of early 

 man loaned by Dr. J. Leon Williams a year ago; it has been 

 greatly expanded in connection with Professor Osborn's re- 

 searches upon this subject. 



Mr. Chubb has made some important additions to the 



exhibition series of skulls and skeletons of modern Equidse; 



_ , . r the Kiang skeleton is completed, a skeleton of 



Evolution of • . ° , . . ■• \ u c 



Grant s Zebra is under way, and a number of 



skulls and other preparations have been added. 



Acknowledgments are due especially to Messrs. Frank K. 



Sturgis and Henry Fairfield Osborn for continued support of 



this phase of the department's work. 



