96 Report of the President 



systematic search there for fossil mammals. During the earlier 

 part of the year, although not officially upon our staff, he yet 

 found time to collect and present to the Museum valuable series 

 of modern reptiles, fishes and invertebrates and a few fossils. 



The skeleton of the "Running Gorgosaurus" a gigantic carniv- 

 orous dinosaur mounted as a panel in a running pose, has been 

 placed on exhibition temporarily in the Hall of the 

 Preparation Age of Mammals, and opposite is a skeleton of the 

 E libit* Ostrich Dinosaur, mounted in a standing pose to 



show the extremely slender proportions and rela- 

 tive height of this comparatively small member of the Dinosaurs. 

 A partial skeleton, chiefly fore and hind limbs, of another Ostrich 

 Dinosaur, is placed beside it. Considerable progress has been 

 made with the preparation for mounting of the two Horned 

 Dinosaur skeletons, the giant Triceratops from Montana and the 

 smaller Monoclonius from Alberta; and with a specimen of the 

 Armored Dinosaur Palceoscincus, in which the head and a large 

 part of the body armor were found in position. This specimen 

 is of particular value as showing for the first time just how the 

 massive bony plates and spines were arranged in this group of 

 armored dinosaurs. 



The skeleton of the primitive Long-Jawed Mastodon, Triloph- 

 odon productus, has been completed and placed on exhibition 

 beside its larger relative the T. giganteus, mounted two years 

 ago. The reconstructed skeleton of the gigantic Eocene flight- 

 less bird Diatryma has been placed in the corridor near the 

 elevator, and the original bones, too much distorted by crushing 

 to articulate properly as a mounted skeleton, are arranged as a 

 panel mount in the wall case close by. This unique skeleton is 

 regarded as one of the great scientific treasures of our fossil 

 collections. The large block of fossil bones in the rock from 

 the Agate Fossil Quarry in Nebraska, in the centre of the Hall 

 of the Age of Mammals, is a very instructive illustration of how 

 these specimens are found and of the probable explanation of 

 their occurrence. 



A skeleton of the Pliocene One-Toed Horse, Pliohippus, has 

 been placed on exhibition, and the mounting of a second skeleton 

 of a young individual is well advanced. When completed these 

 two will be associated in a group exhibit to represent this im- 

 portant stage in the Evolution of the Horse, intermediate in 



