48 



Annals of the Carnegie Museum. 



In the abundant material of Diceratherium cooki in the Carnegie 

 Museum a great variation in the size of the nasal horn cores is ob- 

 served. This is undoubtedly due to differences in age, sexual charac- 



Fig. 12. Top view of skull of Diceratherium cooki. 1 nat. size. Type, No. 

 572. 



ters, and individual variations. When the material from the Agate 

 Spring Fossil Quarry is freed from the matrix full descriptions of the 

 various forms will be given in the publications of the Carnegie 

 Museum. 



Fig. 13. Palate view of skull of Diceratherium cooki. \ nat. size. Type, No. 

 1572. 



