
Fi aay “ i 
812 STRATIGRAPHICAL GEOLOGY. — [Boox VI. 
steering the creature through the water. Hesperornis regalis (Fig. 
398), the type species, must have measured about 6 feet from the 
point of the bill to the tip of the tail. The other genera, Ichthy- 
ornis (Fig. 399) and Apatornis, were distinguished by some types 
of structure pointing backward to a very lowly ancestry. They 

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Fie. 398.—Creraorovs Birp.! 
Hesperornis regalis (Marsh) (;)). 
appear to have been small, tern-like birds, with po wings 
but small legs and feet. They possessed reptile-like skulls, with 
teeth set in sockets, but their vertebrae were bi-concave, like those 
1 For this restoration and Fig. 899, I am indebted to the kindness of my friend 
Professor Marsh. 
