CHAPTER III. 



THE TEETH. 



(Plates I-V, VII-X, XII-XIX, LV and LVI.) 



The teeth of the JJinocerofa constitute one of their most interesting 

 features, dift'ering widelj^ in form and dentition from most of tlie other 

 Uti(/ulata. 



In the genus Dinoceras the dentition is represented by the following 



formula : 



T . .1 ,3,3 



Incisors — , canines — , premolars — , molars — ^r 34. 

 3 1 3 3 



So far as now known, the same formula applies equally well to the 

 genus Tinoceras. 



In UintafJicriuiii, the dentition is apparently as follows : 



T . .1 , •• , ^5 



incisors — , canines — , premolars — , molars — 36. 



3 1 4 3 



The Incisors. 



In none of the Dhiocerata have any ujiper incisors been found, even 

 In tlie youngest specimens. Tlie premaxillary bones appear to be 

 entirely edentulous, although in some specimens, especially in Dinoceras 

 laficrps (number 1039), there are shallow depressions at irregular intervals 

 that strongly suggest the probability of embryonic teeth in very young, or 

 foetal individuals.A fortunate discovery in the future may, perhajjs, settle 

 this point. 



