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, 



3MA- 



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k 



— « 





f 





SCENE IN THE BAD-LANDS OF THE UINTA BASIN— TERTIARY FOSSlL FIELD OF 

 NORTHEASTERN UTAH 



the palaeontologist 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, encies. 



and several hundred characteristic views have been taken, from 



