tOSSlL MAMMAL GALLEfef. 71 



the great extinct Irish Deer (Cermis giganteus), male and female, 

 the former distinguished by its magnificent spreading antlers, 

 resembling those of a Fallow Deer on a large scale. 



The next central case is occupied by the skulls and portions 

 of jaws of a remarkable horned and hoofed quadruped, Arsinoi- 

 therium (fig. 42), from the Upper Eocene of the Fayxim, Egypt. 



Fia. 42.— Skull of ArsineitJierium aitteli, from the Upper Eocene strata of the 

 Fayum, Egypt. The skull is three feet long. 



It belongs to an ancient group perhaps related to the ancestors 

 of the Elephants. 



Equally peculiar is the Toxodon (fig. 43) of the Pampas of S. 

 America, of which a model of an entire skeleton is exhibited. 



Near by is placed a model of a skeleton of the Dinoceras 

 (fig. 44), one of the most remarkable of the many wonderful 

 forms of animal life discovered in the Tertiary beds of the 



