DINOSAURS 179 



must have increased their size and weight. Such a covering 

 seems to be clearly indicated by certain grooves and impressions 

 that mark their surfaces. (See Fig. 64.) The largest plates are 



FIG. 63. Limb-bones of Stegosaurus. (After Marsh.) 

 1. Fore leg. 2. Hind leg. 



unsymmetrical, and were probably arranged along the back, in 

 rows, as in our restoration, Plate XXVI. It will be noticed, by 

 those who are familiar with our first edition, that this Plate gives 



