52 PROCEEDINGS OF THE ACADEMY OF [1890. 



('83a.) " Etude s. 1. Neoplagiatilax d. 1. Faune Eocene infer, d. Env. d. Reim." 



Bull. d. 1. Soc. Geol. d. France. 3Ser.,T. XI, 1883. 

 ('83b.) " Sur VAdapisorex, nouv. gen. d. manim. d. 1. faune Cernays. d. Env. d. 



Reims." Comptes Rendus, Dec, 1888. 

 ('84a.) " Caracteres gen. d. Pleurai^pidotheriHDi, etc." Comptes Rendus, Dec, 



1884. 

 ('85a.) Etude s. C[uel. mamm. d. petite taille d. 1. faun. Cern. d. Env. d. Reims." 



Bull. d. 1. Soc. Geol. d. France, 3 Sen, T. XIII, Jan., ]88r). 

 ('87a.) " Sur le genre Plesiadapis, etc." Comptes Rendus, Jan., 1887. 

 ('87b.) " Sur I'Ensemble d. recherches paleon. faites dans 1' Terr. Tert. inf. d. 



Env. d. Reims." Comptes Rendus, Feb., 1887. 

 ('88a.) " Sur quel. mamm. Carnassiers recuel. dans 1' Eoc inf. d. Env. d. Reims." 



Comptes Rendus, Feb., 1888. 



PERIOD OF THE CERNAYSIAN. 



Dr. Lemoine considers the Cernaysian parallel with the American 

 Piierco and below the AVasatch level, as the fauna is evidently prim- 

 itive and local beds are found above this horizon which contain 

 Hyracotherium and other characteristic Wasatch genera. But Co- 

 rypliodon is found in the Conglomerat de Meudnn, which is generally 

 considered by French geologists as contemporaneous with the Cernay- 

 sian. Upon the whole, the prevailing stages of development observed 

 in the teeth of the different series are .somewhat more modern than 

 the Puerco types and offset the contemporary character given by 

 Arctocyon and Neoplagiatilax.^ The Cernaysian may, therefore, 

 with some certainty be considered intermediate in time between the 

 Puerco and Wasatch, and probably not ftir from parallel with the 

 lower Egerkingen fauna recently described by Riitimeyer. I have 

 arranged the following table, after consulting Professor Gaudry and 

 the geological papers of Lemoine ('80a), de Lapparent (4, p. 1130) 

 and Geikie (5, p. 844). 

 Divisions of the Saessonian or Lower Eocene of France, Paris Basin. 



N. AMERIC.\. GT. BRITAIN. FRANCE. 



C. 



London Clay . . . Sables de Cuise • . . . ^ r, ' ,/ ' • 



■' [ liyracotiieriiim. 



Oldhaven Beds B. Palaeonictis. 



Wasatch Argiles a lignites Coiyphodoii. 



Woolwich Beds Conglomerat de Cer- 



nay, (de Meudon) . . PleitraspidotJierium. 



(Plastic Clay.) A. 



Calcaires de Rilly 



la Montagne Protoadapis. 



Puerco Thanet Sands . . Sables de Bracheux ; 



de la Fere .... Arctocyon priniaevtis. 



Marnes de Meudon 



1 Corresponding to Jllinclaenus and Plilodtts respectively. 



