TERTIARY MAMMAL HORIZONS. 11 



than McniscotJuiiiiin (Wasatch) which it somewhat resembles in 

 teeth, skull and skeleton. 



The fact that neither primiti\'e Ungulates (^CoiidylartJira and 

 Ainblypodd) nor Edentata have been found in the IJiaiicticn or 

 Cernaysien beds, together with their absence in the Suessonien 

 and later periods in the Palceairtic 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 \-er}' 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 

 Egerkingen which has been widel}^ accepted as proving the ex- 

 istence of the Condylarthra in Europe and as in part a very 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- 

 gojiia, PcriptycJms and PJicnacodiis in the Egerkingen collection, 

 which fails to sustain Professor Rutimeyer's identifications. 

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

 the types of the supposed Condylarthra correspond with the 

 larger Bridger or Middle Eocene American monkeys such as 

 Notliarctns, ToniitJicriuni (Cope) Tclmatolcstcs, LininotJicriuni 

 (Marsh) which are astonishingly ungulate in appearance. 



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

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

 fauna and of similar age to Egerkingen. 



Third : because of the absence in Egerkingen of man}' typ- 

 ical lower Eocene or Suessonien types and the abundant pres- 

 ence of typical middle and upper Eocene types. It is improb- 

 able that a Jurassic fissure would accumulate basal Eocene 



