490 



MESOZOIC EEA— AGE OF EEPTILES. 



jaws, but their teeth were set in grooves instead of distinct sockets 

 (Fig. 822), and they differed also in having no keel and in having ordi- 

 nary bird- vertebrae (Fig. 823). These were evidently divers, and in- 

 capable of flight. Two of them — Hesperornis regalis and Lestomis 



v 



■U - 



Fig. 821. 



Fig. 823. 



m 



i&^M-?' 



W>t 



Fig. 820. 



Fig. 824. 



Fig. 822. 



Figs. 820-824.— Odontornithes (after Marsh): 820. Lower Jaw of Iehthyornis dispar. x 2. 821. 

 Cervical Vertebra of same, x 2. 822. Lower Jaw of Hesperornis regalis, x £. 823. Dorsal Ver- 

 tebra, x £. 824. Tooth of same, x 2. 



crassipes — were of gigantic size, being from five to six feet from snout 

 to toe. On next page (Fig. 825) we give a restoration by Marsh of this 

 remarkable bird. In these birds, therefore, we have the most extraordi- 



