36 EEPORT OF NATIONAL MUSEUM, 1913. 



being illustrations of the evolution of the horse and many forms of 

 fishes. In the center of the eastern part of the skyUghted hall 

 is the large, unique, three-horned duiosaur {Triceratops prorsus), 

 of which the skull alone measures 6 feet long. Mounted upright 

 against the adjacent walls are two other exceptionally fine specimens 

 of dinosaurs, besides an example of the duck-billed reptile, Trachodon 

 annectens, over 26 feet long, and a skeleton of the carnivorous reptile, 

 Ceratosaurus nasicomis, of almost equal size. Another exhibit of 

 special interest consists of the skeleton of the large armoured dinosaur 

 Stegosaurus stenops, accompanied by a full-sized model representing 

 this reptile as it appeared in Hfe. In the eastern part of the wing 

 are exliibited the extmct birds, of which the toothed Hesperornis 

 from the chalk deposits of Kansas and the giant moa are especially 

 noteworthy. 



