Fig. 41.—Skeleton of the American Mastodon (Mastodon americanus). Greatly reduced.
The next central case is occupied by the skulls and portions of jaws of a remarkable horned hoofed quadruped, Arsinoïtherium ([fig. 42]), from the Upper Eocene of the Fayum, Egypt. It belongs to an ancient group not closely related to any living animal.
Fig. 42.—Skull of Arsinoïtherium zitteli, from the Upper Eocene Strata of the Fayum, Egypt. About 1/12th natural size.
Equally peculiar is the Toxodon ([fig. 43]) from the Pampas of S. America, of which a model of an entire skeleton is exhibited.
Fig. 43.—Skeleton of the Toxodon (Toxodon platensis).
From the Pampas Formation of Argentina. About 1/18th natural size.
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 western portion of the United States of America. This animal combines in some respects the characters of a Rhinoceros with those of an Elephant, and has others altogether special to itself. The group to which it belonged became extinct in the Oligocene, or Middle Tertiary, period, without leaving any successors.
