DIXOTIIERIUM. 



31 



surface, which is strongly inclined forward : there seems to 

 have been scarcely any development of spongy bone in the 

 occipital region. The teeth are of a much simpler character 

 than those found in the Mastodon-elephant line. In the upper 

 jaw of the adult there are two premolars, both simpler than 

 the molars; of these molars the anterior one consists of three 

 transverse crests, the other two of two crests only, a notable 

 peculiarity, since in the other Proboscidea it is the hindermost 



Fig. 18. 



Skull of Dinothcrium giganteum from the Lower Pliocene of Eppelsheiin, 

 Hesse-Darmstadt. jV nat. size. 



molar which is the most complex. The posterior milk-molar 

 also has three crests. In the lower jaw in addition to the 

 down-turned tusks there are two premolars and three molars. 

 As in the upper jaw, the premolars are simpler than the molars : 

 the anterior molar has three crests, the second and third two 

 only, though in the last there may be a trace of a third. In 

 the young there are three milk-teeth, the hinder one having 



