1898.] Osborn^ Evolution of the Aniblypoda. Part I. 



191 



Series I. 



C. wortmani. 



Series II. 



C. testis . . . . 



repandus. . . , 

 marginatus 



cinctus 



semicinctus . 

 lohatiis .... 



anax 



pachypus . . . , 

 elephantopiis . 

 cuspidatus. . 

 obliquus . . . 

 latipes ... . 

 latidois .... 

 ventnnus . . . 



Series III. 

 C. ar mains . 

 ' ' sim us ... . 

 " molestus 

 ' ' lomas . . . 



Incert.^ Sedis. 

 C. radians . . . . 

 " hamatus 



" suhqiiadrattis 

 " curvicristis . . 

 ' ' singula lis . . . 



N. M. 



X. 



Wasatch. 



X 



-■s. 







Wind River. 



Pi «• 



X 



X 



Molar Types. — It is essential, first, to clearly conceive the 

 correlated changes taking place in the upper and lower molar 

 teeth, as shown in the accompanying figures and diagrams. 



In the upper molars : 



I. PaiitolanibJa (Fig. 2) exhibits the triangular upper molar 

 ancestral to Coryphodou, ectoloph (with crescentic cones and nieso- 

 style) at right angles to ])rotoloph 



