210 P. E. Raymond — Cer atopy ge Fauna 



about the same horizon as C. ozarkensis. C. tenuisculpta 

 was found associated with Apatokephalus finalis, Sym- 

 physurus eufekensis, and other typical fossils of the Cera- 

 topyge zone. SauJcia marica (Walcott) and Osceolia 

 osceola (Hall), the only other described Dikelocephalids 

 in the Eureka district, are found in the Dunderberg shale, 

 beneath the Pogonip, associated with what appear to be 

 Upper Cambrian faunas. 



Either the Ozarkian (Ulrich, non LeConte) is not repre- 

 sented in this area, or else it is represented by the zone 

 with Cer atopy ge. The latter alternative would be in 

 accordance with my view of twelve years ago, 17 when I 

 urged that the Ceratopyge zone of the Eastern states 

 might be joined with the Ozarkian. Later studies in the 

 Appalachians have however convinced me that so far as 

 Eastern North America is concerned, there is no Ozarkian 

 System, and the evidence of the Ceratopyge fauna 

 indicates the same for the West. 



Museum of Comparative Zoology, 

 Cambridge, Mass. 



17 This Journal, vol. 30, p. 344, 1910. 



