BIG BADLANDS OF SOUTH DAKOTA. 495 



forms from the Protoceras beds, perhaps the same as some of the 

 fragmentary specimens in the Princeton collection already referred 

 to. With the kind permission of Professor Osborn and Dr. Mat- 

 thew, I hope to pursue these studies farther, on the collections in 

 their charge. 



The facts presented regarding habits amplify Professor Scott's 

 published observations and have an important bearing on the sup- 

 posed function of the dependent process of the jugal which pro- 

 jected far enough beyond the cheek to be grasped and badly injured 

 by the teeth of an adversary. 



