250 



ECHINODERMATA ECHINOZOA 



SUB-BRANCH III 



thurian origin, but as a rule are incapable of more precise determination. 

 On the other hand, however, Schlumberger has described a number of minute 

 calcareous bodies from the Calcaire Grossier (Eocene) of Paris, which seem 

 very certainly referable to the genera Synapta, Chirodotc^ and Myriotrochus. 



TABLE SHOWING THE VERTICAL EANGE OF THE ECHINOIDEA. 



