NO. I THE WHITE RHINOCEROS — HELLER 69 



PLATE 23 

 (About T /i natural size) 



Illustrating age differences in nasal boss development between both sexes 

 and also individual variation in zygomatic breadth. 

 Fig. 1. Ceratotherium simian cottoni, male, adult; from Rhino Camp, Lado 



Enclave ; shot by Kermit Roosevelt, January 20, 1910. No. 164593, 



U. S. National Museum. 

 Fig. 2. Ceratotherium simutn cottoni, male, immature; last milk molars still 



in use; from Rhino Camp, Lado Enclave; shot by Col. Theodore 



Roosevelt, January 15, 1910. No. 164635, U. S. National Museum. 

 Fig. 3. Ceratotherium sinium cottoni, female, immature; last milk molars still 



in use, but premolars not yet in tooth line; from Rhino Camp, 



Lado Enclave ; weathered skull. No. 164599, U. S. National 



iMuseum. 

 Fig. 4. Ceratotherium simum cottoni, female, adult; from Rhino Camp, Lado 



Enclave ; shot by Col. Theodore Roosevelt, January 21, 1910. 



No. 164594, U. S. National Museum. 



