NO. I 



THE WHITE RHINOCEROS HELLER 



61 



PLATE 15 



(About Y% natural size) 



Illustrating generic characters 



Fig. i. Ceratotherium simum cottoni, female, old; from Rhino Camp, Lado 

 Enclave; weathered skull. No. 164597, U. S. National Museum. 



Symphysis broad and truncate along front edge, and extending 

 well beyond tooth row; teeth occasionally showing fossettes of 

 enamel. 



Fig 2 Diceros bicornis, male, old ; Loita Plains, Southern Guaso Nyira 

 British East Africa ; shot by Col. Theodore Roosevelt, June 18, 

 1909. No. 162930, U. S. National Museum. 



Symphysis short and rounded, not produced much beyond tooth 

 row. 



Fig. 3. Rhinoceros unicornis, immature ; milk molars in use ; from the 

 menagerie of Barnum and Bailey; sex and origin unknown. 

 No. 16251, U. S. National Museum. 



Symphysis bearing two pair of incisors, the outer developed into 

 formidable tusks; diastema long (permanent outer incisors just 

 erupting, the milk still in position in figure). 



