14 



developed wings and a keeled sternum, and a tail like that of 

 ordinary birds. They were rather small birds, in size and general 

 form suggestive of the common Tern, which they may have some- 



Fig. 4. Restoration of the skeleton of Ichthyornis. The restored portions are unshaded. 



what resembled in habits, being aquatic, and furnished with 

 powerful wings and small feet and legs. 



Fig. 4 represents a restoration of the skeleton of one of the 

 species {Ichthyornis dispar), by Professor Marsh, 



