Cooperation With Foreign Museums 101 



study of the characters of the lachrymal bone of the face in 

 vertebrates, especially in mammals, and its bearing upon vari- 

 ous difficult problems in the evolution of the face from the 

 primitive fishes of Palaeozoic times to modern man. 



Dr. Mook has published a series of articles in the Bulletin, 

 presenting the results of his researches upon the osteology of 

 living and extinct Crocodilia. 



Professor Osborn continued actively his researches upon the 

 Sauropod Dinosaurs, and especially upon the American Pro- 

 boscidea. 



Dr. Marjorie O'Connell, as special research assistant, gave 

 approximately three months' time to studies upon the new and 

 valuable collections of invertebrates secured by Mr. Barnum 

 Brown in the Jurassic limestones of Cuba. Her report upon 

 the collection will be completed in 192 1. 



During the autumn Dr. Matthew visited the principal scien- 

 tific museums of Europe, with a view to renewing old relations 

 of interchange and cooperation which had been 

 Exchange and largely broken off by the war, and of developing 



W& Foreign suc ^ new relations as might be advantageous. He 

 Museums visited thirty-three museums in Sweden, Ger- 



many, Austria, Italy, Switzerland, France, Bel- 

 gium and England, and made arrangements for exchange of 

 publications, specimens, and casts, finding everywhere a most 

 cordial reception, very friendly attitude towards the American 

 Museum and high appreciation of its work. 



The catalogue of photographs of fossil vertebrates contains 

 2,644 numbers to date, besides 292 photographs not yet cata- 

 logued. The additions during the year were 

 Photography chiefly Paleocene mammals. 

 fi? d ^ .- Paleocene mammals i?i 



Illustration . ° 



Pliocene (Fnck Collection) 90 



Fossil Proboscidea 40 



Dinosaurs ! 7 



Crocodilia 9 



Miscellanea 15 



292 



