ORDINAL TYl'KS OF MOLARS: AMI5LYPODA 



165 



a i 



Fig. 13S. Upper and lower teeth of Hcmithln us kowali '</. lunus, from the Basal Eocene (Puerco). 

 Compare Figs. 137, 130. x -}-. After Matthew. 



Fig. 130. Upper and lower teeth of Conacodon entoconus, a Basal Eocene (Puerco) relative of 

 I'ti-iptychv.s. x |.. Observe the reduction of the paraconid in the lower molars correlated with 

 the development of the hypocone from the basal cingulum of the upper molars. The upper 

 molars remain tritubercular, although the protocone is somewhat pushed forward. (Cf. 

 s). The cusp marked msd is the hypoconulid. 



ints , 



mesostyle 



c 



D 



FIG. 140. Primitive Amblypod, Pantolambda cavil-ictus, from the Torre j on Formation. Stage 

 II. Basal Eocene. A. Superior molars ; B. Diagram of same ; C. Inferior grinders ; D. Mandible. 

 Observe the central position of the protocone as in all the Amblypoda, the crescentic cutting 

 modification of the para- and metacones, the strong development of the para-, nieso-, and meta- 

 styles. In the lower molars, the paraconid is reduced and there is a tendency to form two sharp 

 ridges, the first from the protoconid and metaconid, the second from the hypoconid and ento- 

 conid. (Cf. Cor>i,,h,l,,,', Fig. 141.) 



