184 EXTINCT -MONSTERS 
present day fight with their horns. The mouths of these Dino- 
saurs formed a kind of beak, sheathed in horn. 
The body as well as the skull was protected, but the nature 
and position of the defensive parts in different forms cannot 
yet be determined with certainty. Various spines, bones, and 
plates have been found that evidently were meant for the protection 
of the creature’s body, and belonged to the skin. Probably some 
of these were placed on the back, behind the crest of the skull; 
Fic. 66.—Bony spines possibly belonging to the skin of Triceratops. 
(After Marsh.) ? 
some may have defended the throat, as in Stegosaurus. Alto- 
gether, Triceratops is very different from any other Dinosaur. One 
cannot help picturing it rather as a fierce rhinoceros-like animal. 
In the restoration (Plate XXIX., Frontispiece) our artist has given 
it a thick skin, rather like that of the rhinoceros, only indicating 
small bony plates, etc., here and there. 
Professor Marsh thinks that as the head increased in size to 
1 There is some doubt about these spines; for they might possibly belong to 
the carnivorous Dinosaur Tyrannosaurus found in the same place (see p. 139). 
Mr. Barnum Brown has recently described (1906) two sternal bones, previously 
unknown, but they are unlike those of Diplodocus and Brontosaurus. 
