62 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



PLATE lo 



(About l /i natural size) 



Illustrating generic characters 



Fig. i. Ceratotherium si»ut)>i cottoni, female, old; from Rhino Camp, Lado 



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

 Anterior edge of ascending ramus slanting backward uniformly, 



in line with the coronoid process ; coronoid process long and 



slender ; symphysis deep. 

 Fig. 2. Diceros bicomis, male, old ; Loita Piains, Southern Guaso Nyiro, 



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



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

 Outer edge of coronoid process produced forward giving the 



ascending ramus a concave anterior border; coronoid process 



short; symphysis shallow. 

 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. 

 Outer edge of ascending ramus vertical; coronoid process short; 



symphysis shallow and elongate, bearing large outer incisors at 



its anterior angle. 



