Report of the President 81 



(through D. Appleton and Company) entitled "Whale Hunt- 

 ing with Gun and Camera," as a by-product of his eight years 

 of field work in collecting Cetaceans for the Museum. 



EXTINCT VERTEBRATES 



Department of Vertebrate Palaeontology 



Henry Fairfield Osborn, Curator Emeritus 

 W. D. Matthew, Curator 



The Museum continued its explorations in northwestern 



Montana for Cretaceous dinosaurs and, under the direction of 



Mr. Barnum Brown, secured a large collec- 

 Field Expeditions ^ of wh{(± the mQst important spe cimen 



is the skeleton of a dwarf type of horned 

 dinosaur discovered by Mr. Johnson of Mr. Brown's party. 

 Important evidence was noted as to the succession of the 

 formations and the evolution of the Cretaceous dinosaur fauna. 

 A second expedition, in charge of Mr. Walter Granger, con- 

 tinued the search for Paleocene and Eocene mammals in New 

 Mexico and Colorado and obtained a valuable collection, in- 

 cluding a skull, jaws and partial skeleton of an animal related 

 to Tillotherhim, a rare and peculiar Eocene mammal. This 

 specimen was found by Mr. George Olsen of Mr. Granger's 

 party. The third expedition, in charge of Mr. Albert Thom- 

 son, was engaged chiefly in reconnaissance work in the Mio- 

 cene and Pliocene formations of western Nebraska, and also 

 continued operations in the great fossil quarry at Agate, 

 Nebraska. Dr. Matthew joined this party in the field during 

 June and July and Professor Osborn in September. A con- 

 siderable collection of fossil mammals was obtained by this 

 expedition, and in addition two skeletons of Pliohippus, one 

 found by Mr. Harold J. Cook, the other by Mr. E. L. Troxell, 

 were purchased for the Museum. These represent the Pliocene 

 stage of the Evolution of the Horse, known hitherto only from 

 fragmentary specimens. The most important discovery of the 

 season was made by Mr. William Stein during a short collect- 

 ing trip for the Museum in the Eocene of the Big Horn basin, 

 Wyoming. This is a nearly complete skeleton of a gigantic 

 fossil bird, equaling the extinct Moa of New Zealand in bulk, 



