u 



their bony structure is as well known as that of modern birds. 

 Especially is this the case with the genus Hespei-ornis (western 

 bird), the best known species of which, H. regalis (the royal west- 

 ern bird), would stand about three feet high, with a general resem- 

 blance to a Loon or Grebe. In many points Hesperornis strongly 



/ 



Fig. 6. Restoration of Hesperornis. 



resembles some modern birds, but in other features shows unmis- 

 takably its reptilian ancestry. 



Casts of some of the principal bones of Hesperornis may be 

 seen in Alcove Case No. 13 of the Geological Hall. 



Fig. 5 gives a figure of the skeleton (after Marsh), and Fig. 6 a 

 hypothetical representation of its external appearance, by Dr. 



