Ixxsviil PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 1 895, 



gather evidence of still earlier and more simple forms of life than 

 are met with in the ' Olenellus-zone.' We are fully justified in 

 concluding that such must actually have existed, because we find 

 in the Lower Cambrian evidence of a quite considerable fauna 

 belonging to several divisions, which, although lowly in themselves, 

 are nevertheless already so clearly differentiated one from the other 

 as to prove to us that we are still, both biologically and chrono- 

 logically, very far removed from the commencement of life on the 

 earth. 



