NO. I THE WHITE RHINOCEROS HELLER 13 



that is, head-skin and skull ; one single skull, and four weathered 

 skulls picked up on the veldt. This gave us a total of 14 specimens, 

 12 of them being adult in size, one a nursing calf and the other a 

 foetus. 



DESCRIPTION OF SPECIES 



Genus CERATOTHERIUM 



1867. Ceratotherium Gray, Proc. Zool. Soc, London; type Rinoceros simits. 



Species C. simum, the type and only known species. 



Generic characters. — No functional incisors or canines ; skull doli- 

 chocephalic, the lambdoidal crests of the occipitals greatly produced 

 and extending posteriorly far beyond the condyles ; parietal and occip- 

 ital plane of skull very little deflected upward from the general dorsal 

 outline ; post-glenoid and post-tympanic processes separated so as to 



leave the auditorv meatus open ; teeth, milk molars — ° "*" , pre- 



1-2-3-4' * 



molars — s^ljt. molars — — ^ =— , hvsodont, formed into complex folds, 

 2-3-4 1-2-3 7 



the surfaces soon becoming worn down level and showing three 



enclosed fossettes of enamel which are filled with cement as in Eqiius; 



mandible truncate at symphysis with the ascending ramus not sharply 



deflected from the level of the dental portion of the bone. External 



characters are the square mouth, blunt nose and fleshy hump on the 



nape of the neck, and the absence of dermal folds on the body. 



In Diceros the skull is much shortened, the occipital portion show- 

 ing no projection beyond the condyles, but showing decisive differ- 

 ences in the elevation of its parietal and occipital regions above the 

 general outline of the skull. The simplified brachyodont teeth show 

 in their structure a primitive condition. Another difference is the 

 presence of the first premolar as a functional tooth in both jaws. 

 Besides these great differences, Diceros shows a prominent massive 

 process at the basisphenoid and basioccipital suture, more slender 

 parooccipital and post-glenoid processes and longer middle pterygoid 

 fossa and shorter anterior palatine fossa. The mandible differs in its 

 pointed or obtuse symphysis and in its sharply angulated ascending 

 ramus and shorter coronoid process. 



Compared to Coelodonta, the type of which is the recently extinct 

 woolly rhinoceros, the chief differences are the greater development of 

 the internasal septum which is fully ossified and fills up the space 

 between the nasals, maxillae and premaxilke ; the greater projection of 



