FOSSIL SKULL OF TOXODON. 



115 



external ones very large, curved, with their sockets 

 extending back in an arched direction through the inter- 

 maxillary bones to the maxillary, and terminating-, without 

 becoming contracted, immediately anterior to the grind- 

 ing teeth. In the lower jaw the two middle incisors are 

 largest, the rest gradually diminishing in size. (Fig. 73.) 

 The molar teeth also were rootless, and curved, whence 

 the name toxodon (to^ov, a bow, oSovs, a tooth) ; and 

 their grinding surface presented one or more folds of 

 enamel re-entering the osseous substance of the centre, 

 as in Rodents. See Fig. 77, the last molar teeth but 

 one of upper jaw ; Fig. 78, the grinding surface of the 

 same ; Fig. 79, the grinding surface of the correspond- 

 ing molar of lower jaw. 



.% ' 



F'K. 77 



We might here enter on many minutise, and follow 

 Professor Owen through his anatomical details, were it 

 not that they are rather adapted for the close attention 

 of the comparative anatomist than the general reader. 

 Those who wish to gain the fullest information on these 



