DICHODON 335 



has a thicker and shorter crown with two pairs of cusps. 

 The upper true molars (m i, 2, 3 ) have the two pairs of cusps 

 sharp and pointed, with a series of five low accessory points 

 developed from the outer part of the cingulum. The lower 

 molars (in 1, 2, 3) have as complex crowns as the upper ones, 

 but with the accessory basal points (a, b, c, e\ developed from 

 the inner, instead of the outer side of the crown, and with the 

 convex sides of the chief cusps turned in the opposite direc- 

 tion to those above. At the upper part of j0jt!f$@%h 

 fig. 102 the outer side of the true molars, of a ■■■%&£&&$ i 

 the last premolar, of the canine, and of the c I H c > 

 incisors, is shown, together with the grinding fn 



surface of the three anterior premolars in the TT °' , ' e 



r Upper molar ot 



upper jaw. Below these the inner surface Dichodon. 

 of the entire series of the lower teeth is shown, together with 

 the grinding surface of the three true molars, the last of 

 which (m 3) here supports a third pair of lobes (e.) As 

 compared with the anoplotherian molar (fig. 100), the outer 

 lobes (a, 6) of that of the Dichodon (fig. 103) are thicker and 

 sharper ; the inner ones (c, d) — especially the latter — are 

 developed to an equality with the outer ones, and more 

 distinctly separated from them. The valley (m) extends 

 across the whole breadth of the tooth, and is crossed at right 

 angles by the fore-and-aft doubly-curved valley (# and i). 

 The extinct species showing the above characters, and on 

 which the genus was founded* was nearly the size of a fallow- 

 deer : it is called Dichodon cuspidatus, in reference to the num- 

 ber of sharp points on the unworn molars. The dentition 

 indicates that its food may have been of a peculiar character, 

 perhaps not exclusively of a vegetable nature. 



In the same upper eocene formation of Hampshire have 

 been found instructive examples of some smaller members of 

 the extinct anoplotherioid family. 



* Quarterly Journal of the Geological Society, torn, iv., 1847, p. 36, pi. 4. 



