88 THE FAR PAST. 



terites are a comparatively recent discovery in the higher 



1. Lingula : 2, Rbynconella : 3, Pentarnerus; 4, Strophomeua ; 5, Spirifer : 6, Murchisouia 

 7, Orthoceras ; 8, Lituites ; 9, JVIaclurea. 



beds of the system, and two of the most abundant genera 



1, Fhacops; 2, Trinucleus ; 3, Ampyx ; 4, Ogygia; 5, Ilaenus ; 6, Calyrnene ; 

 7. Calymene coiled up. 



