Ancestors 3 
bones of these birds were discovered by Professor Marsh 
imbedded in the rocks of western Kansas, and they are 
now preserved in the museum of Yale University. Pro- 
fessor Marsh tells us that Hesperornis, the Bird of the 
Fic. 1.—Restored skeleton of Ichthyornis (after Marsh). 1/2 natural size. 
West, “was a typical aquatic bird, and in habit was 
doubtless very similar to the loon, although, flight being 
impossible, its life was probably passed entirely upon 
the water, except when visiting the shore for the purpose 
of breeding. The nearest land at that time was the suc- 
