182 EXTINCT MONSTERS 
Between 1832 and 1837 he discovered three specimens showing 
ribs, limb-bones, vertebree (of the tail), bony plates, and spines. 
Unfortunately the skull and teeth are unknown; but the tail 
appears to have been nearly six feet long. Mr. Waterhouse 
Hawkins’s model in the grounds of the Crystal Palace, at Sydenham, 
near that of the Iguanodon, is rather a premature attempt at 
restoration. | 
The last, and in some ways the strangest of the Dinosaurs, 
was the Triceratops! that flourished in America at the end of the 
Fic. 65.—Skull of Sterrolophus allied to Triceratops, seen from above. (After 
Marsh.) 
long Mesozoic era, during the Cretaceous period. The name 
refers to the three horn-cores found on the skull, which probably 
supported true horns like those of oxen. Whereas the Stegosaur 
was provided with quite a small skull, this monster had one of 
huge dimensions and remarkable shape (see Fig. 65 and Plates 
XXVII. and XXVIII.). In the younger ones it was about six feet 
long, but in an old individual must have reached a length of seven 
or eight feet. Such a skull is only surpassed by some whales of 
1 Greek—treis, three; ceras, horn; ops, face. 
