No. 2.] THE RELATIONS OF PROTOCERAS. 367 



odus has developed a hypsodont type of molar and curious 

 lower incisors, while in Protoceras the principal modifications 

 have been those of the skull. 



Until the forerunners of Protoceras have been found, these 

 conclusions can be only conjectural, but such a solution of the 

 problem offers fewer difficulties than any other now available. 

 The table on the preceding page displays the position of the 

 genus according to this view. 



Geological Museum, Princeton, N. J., 

 July 26, 1894. 



