12 THE AMERICAN MUSEUM JOURNAL 
bones of one animal together was unusual, and this fact renders difficult 
the efforts to determine the relationships of the peculiar forms that were 
encountered. 
With one or two minor exceptions, the entire known fauna of the 
Upper Eocene of the region is represented in the collection obtained by 
our expedition, and there is much material which will add to the pub- 
lished knowledge of these forms. In addition, several new forms were 
discovered, some of them representing new families. The collection 
is particularly rich in remains of the primitive carnivores, or creodonts, 
EXHUMING SKULL OF ARSINOITHERIUM, 
In the background the northern rim of the Fayoum depression. 
of which two splendid skulls were obtained. The artiodactyls are well 
represented, as are also the hyracoids, animals with supposed relation- 
ship to the living Hyrax, or Coney. Of considerable scientific im- 
portance was the discovery of rodents, which are represented in our 
specimens by at least two genera. 
The largest and most striking find in the Fayim deposits was the 
Arsinoitherium, an animal with a body suggesting both an elephant 
and a rhinoceros. ‘The head carried a pair of enormous horns on the 
