NO. I THE WHITE RHINOCEROS HELLER 6l 



PLATE 15 



(About */& natural size) 



Illustrating generic characters 



Fig. i. Ceratotherium simnm 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 Dicer os bicomis, male, old ; Loita Plains, Southern Guaso Nyiro. 



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). 



