54 



PROCEEDINGS OF THE ACADEMY OF 



[1890. 



With these primitive features in common, the orders are never- 

 theless sharply distinguished from each other, and the writer's prin- 

 cipal grounds for considering this horizon as more recent than the 

 Puerco, are the numerous instances of a high degree of reduction and 

 specialization. The lemuroids are very abundant, with the long 

 slender tail and rotating forearm of the climbers. Plesiadapis is 

 an exact counterpart in jnolar development of the remarkably re- 

 duced Anaptomorphus of the Wasatch, while the older Protoadcqns 

 has the fuller dentition of the Puerco Indrodon. Adapisorex is not 

 a related form as its name would indicate but should be classed with 

 the tiny Adapisorlculas among the Insectivora. Pleuraspidother- 

 ium and Orthaspidotherium were also probably insectivores and as 

 they are both represented by well preserved skulls and portions of 

 the skeleton they constitute by far the best known of the early mem- 

 bers of this important order. All the above animals belong to the 

 smaller and least primitive members of this fauna. The more an- 

 cient fades is given by the small and large Creodouts. Hycenodic- 

 tis is a small animal with molars similar to those of the Puerco Trii- 

 sodon. Tricuspiodon has an inferior tuberculo-sectorial of the most 

 primitive type. Arciocyon is the largest animal, with molars of the 

 Puerco Miockenas pattern. The minute Neoplagiaulax is in a slightly 

 later stage of development than the Puerco Plilodus of Cope. No Con- 

 dylarthra have as yet been discovered in the Cernaysian ; the absence 

 of ungulates is thus in marked contrast with their abundance in the 

 Puerco and Egerkingen strata. 



Calcaires de Rilly 



Protoadapis 



" crassicuspidens 



" recticuspidens. 



" curvicuspidens. 



THE RHEIMS FAUNA. 



Conglomcrat dc Cernay 

 (Lemuroidea. ) 



Protoadapis Copei. 



Plesiadapis tricuspidens 

 " Remensis 

 " Gervaisii 



(Insectivora.) 



Adapisorex Gaudryi 

 " Chevillioni 



Adapisoriculus minimus 



Pleuraspidotherium Au- 

 monieri 



Pleuraspidotherium De- 

 lessei. 



Orthaspidotherium, 

 ^Creodt)nta.) 



Arctocyon Gervaisii. 

 " DueiHi. 



Ar piles a liniites. 



Plesiadapis Daubreei. 



" Chevillioni. 



(Ungulata.) 

 Pachynolophus. 

 Protodichobune. 

 Lophiodochoerus. 



Lophiodon. 



