This restoration, made by Mr.Knight under supervision of Professor Osborn, embodies the latest evidence as to the structure and characteristic poses of these animals, the character of the skin and their probable habits and environment.

_After Osborn_] "Impressions of the more common plants found in the rocks of this period with sections of the tree trunks showing the woody structure will be [have been] introduced into the group as the ground on which the skeletons stand.

In the rivers and bayous of that remote period there also lived many kinds of Unios or fresh-water clams, and other shells, the casts of which are frequently found with Trachodon bones.
The fossil trunk of a coniferous tree was found in Wyoming, which was filled with groups of wood-living shells similar to the living Teredo.
These also will be introduced in the ground-work.
"The skeleton mounted in a feeding posture was one of the principal specimens in the Cope Collection, which, through the generosity of the late President Jesup, was purchased and given to the American Museum.
It was found near the Moreau River, north of the Black Hills, South Dakota, in 1882, by Dr.J.L.Wortman and Mr.R.S.Hill, collectors for Professor Cope.

The erect skeleton came from Crooked Creek, central Montana, and was found by a ranchman, Mr.Oscar Hunter, while riding through the bad lands with a companion in 1904.

The specimen was partly exposed, with backbone and ribs united in position.