Researches on Fossils 97 



of Dr. Mook, and a memoir upon the skeleton of Camarasaurus 

 in the Cope collection has been completed. Dr. Matthew has 

 published two preliminary articles concerning the newly dis- 

 covered Antillean faunas, and has nearly completed the 

 memoir describing the remarkable Cuban fossils discovered by 

 Professor La Torre and Mr. Barnum Brown. The memoir 

 upon the Paleocene faunas by Dr. Matthew and Mr. Granger, 

 describing the quadrupeds which lived at the beginning of the 

 Age of Mammals, has made considerable progress during the 

 year, both as to text and illustrations, but is still far from com- 

 plete. Dr. Gregory has in press two important memoirs, one 

 describing the Eocene lemuroid primates, the group of ani- 

 mals from which the later monkeys, apes and man evolved, 

 the other, a comparative study of the lachrymal bone in the 

 Mammalia. A study of the collections of Pliocene mammals 

 obtained in 1918 from the Snake Creek beds in western Ne- 

 braska was made by Dr. Matthew, but publication of the 

 results is deferred until illustrations can be made. 



Dr. Mook has devoted a part of the year to a compara- 

 tive research upon the existing and extinct Crocodilia, and 

 has completed certain preliminary studies in this subject. 



Considerable time was also given by the Curator and Dr. 

 Gregory to the preparation of various popular or semi- 

 popular articles, notices, etc., and by all members of the staff 

 to aid scientific visitors in the examination and comparison of 

 Museum types and other specimens. Two articles by Messrs. 

 Gidley and Miller of the United States National Museum staff,, 

 descriptive of American Museum specimens, have been pub- 

 lished in the Bulletin. 



