358 



ANATOMY OF VERTEBRATES. 



the anterior talon being most produced and compressed in the 

 first tooth, p 2. 



Certain huge fossil bilophodont grinders, which seemed to indicate 

 a gigantic Tapir, are now known, by the discovery of the cranium, 

 and the enormous tusks of the lower jaw, fig. 288, i, to belong to 

 a genus connecting the tapiroid with the proboscidian families. 



The permanent dentition of the genus Dinotherium is — 



.0.0 0.0 2.2 3.3 



i — ; c — -; » i-r: m 



22. 



1.1 0.0' ' 2.2' 3.3 



The two deciduous molars in situ on each side of the fragment ot 

 the upper jaw of the young Dinotherium, which Professor Kaup 1 

 has figured, answer to the third and fourth of the typical series. 

 The crown of the anterior milk-molar supports two transverse 



288 



ridges with an anterior and posterior basal ridge; its contour is 

 almost square ; the last milk-molar has a greater antero-poste- 

 rior extent, and supports three transverse eminences with an 

 anterior and posterior basal ridge, the anterior ridge being 

 developed into a pointed tubercle at its outer end. The two 

 premolars, fig. 288, p 3 and 4, conform to the general rule in 

 being more simple than the teeth which they displace and suc- 

 ceed. The transverse diameter of the second premolar exceeds the 

 antero-posterior one, the proportions being the reverse of those of 

 the deciduous molar, which it displaces. The first true molar, m 

 i, repeats the structure of the hindmost deciduous molar, its crown 

 1 clxix", p. 401 ; and cxm". Tab. i. 



