TERTIARY MAMMAL HORIZONS. 11 



than Mciiiscotlicriuin (Wasatch) which it somewhat resembles in 

 teeth, skull and skeleton. 



The fact that neither primiti\-e Ungulates {Coudylartlira and 

 Amblypodd) nor Edentata have been found in the T/iaiieticii or 

 Cernaysien beds, together with their absence in the Suessonien 

 and later periods in the Palcparctic region, lends some probability 

 to the hypothesis that Condylarthra, Amblypoda and Edentata 

 were exclusively Nearctic during the lower Eocene. On the 

 other hand the Cernaysien beds may present a \^ery imperfect 

 picture of life in France during this period. 



3. Egerkingen Beds more recent than Puerco, Torrejon or 



Wasatch 



Nor is the above probability lessened by the testimony of 

 Egcrkingcn which has been wideh' accepted as proving the ex- 

 istence of the Condylarthra in Europe and as in part a veiy old 

 fauna. 



The suppositions of Riitimeyer ('88), already questioned by 

 ScHLOSSER ('95), that the older portion of the famous fissure 

 fauna of Egerkingen is of Puerco age and that it contains Condy- 

 larthra are rendered improbable by the following considerations. 



First : by my examination of the teeth referred to Euproto- 

 gonia, PcriptycJius and Plicnacodns in the Egerkingen collection, 

 which fails to sustain Professor Rutimever's identifications. 

 Egerkingen is rich in small FLocene Primates ; it is possible that 

 the types of the supposed Condylarthra correspond with the 

 larger Bridger or Middle Eocene American monkeys such as 

 Not/iarctns, Tomitlicrium (Cope) Tclviatolcstcs, LimnotJicriinn 

 (Marsh) which are astonishingly ungulate in appearance. 



Second : I have certainly seen similar primate teeth in Pro- 

 fessor Deperet's collection from Lissicii ; this is also a fissure 

 fauna and of similar age to Egerkingen. 



Third : because of the absence in Egerkingen of many typ- 

 ical lower Eocene or Suessonien types and the abundant pres- 

 ence of typical middle and upper t^ocene types. It is improb- 

 able that a Jurassic fissure would accumulate basal Eocene 



