THE COLLECTION OF FOSSIL VERTEBRATES 25 
surviving relatives and the habits of life for which the animals 
seem to have been fitted. The general proportions of the animal, 
the outlines and form of head and body, and, to a great extent, the 
expression of the features are usually accurately known from 
the fossil skeleton. The nature of the skin is sometimes but not 
often certainly known, and the coloring is always conjectural, 
' , 
; 
SCENE IN THE BAD-LANDS OF THE UINTA BASIN—TERTIARY FOSSIL FIELD OF 
NORTHEASTERN UTAH 
the palzontologist and the artist having been guided by the col- 
oring of living relatives and the supposed habits of the animal. 
The window transparencies are enlargements from photo- 
graphs of the regions where the fossils occur, and generally show 
the localities where unusually fine specimens in this window 
hall were found. The expeditions sent out yearly to  Transpar- 
the fossil fields carry with them photographic outfits, entien, 
and several hundred characteristic views have been taken, from 
