OP THE SWISS JURA AXD EXGLAXB. 



2:59 



attention to the important differences between the limits of the 

 stages in England and those bearing the same name in Switzerland. 



Mr. Roberts, in reply, said that Cidaris florigemma was found 

 abundantly in the ' Terrain a Chailles siliceux.' Nerincea he had found 

 in Astartian and Pterocerian. The Portlandian of the Jura appeared 

 to be a single group. 



Mr. Etheridoe said there were specimens, apparently, of Pteroceras 

 oceani from Portland in the British ILuseum. 



