282 THE CANADIAN NATURALIST. [Vol. viii- 



following- plants which have been shewn by him to be peculiar 

 to the metamorphic rocks of Central Canada : 



Aspleninm ebeneum. 



Carex longirostris. 



Arabis hirsuta, var. Virginica. 



Polygonum tenue. 



Ceanothus ovalis. 



Dicramum Muhlenbergii. 



Dicranmm spurium. 



NEW FACTS RELATING TO EOZOON CANADENSE. 



By J. W. Dawson, LL.D., F.R.S. 



(From the Proceedings of the American Association for the Advancement of 

 Science, Buffalo Meeting, August, 1876.) 



At the last meeting of this Association, I had the pleasure of 

 exhibiting some specimens of Eozoon Canadense, and of giving 

 some? oral explanations as to its nature and mode of occurrence. 

 I now ask permission to mention a few additional facts which 

 have been made known since the meeting at Detroit, and which 

 still further contribute to our knowledge of the most ancient 

 known fossil. 



(1.) I would first beg leave to direct attention to the very 

 interesting series of specimens now on exhibition in Philadelphia, 

 in the collection of the Canadian Geological Survey; and which 

 give a rare opportunity to study the various aspects of the fossil. 

 In connection with Eozoon, I would also mention the remarkable 

 mass of Graphite from Buckingham on the Ottawa, exhibited by 

 the Dominion Plumbago Company of Canada. This mass is 

 from one of the great beds of that mineral occurring in the 

 Lower Laurentian, on a horizon not remote from that of Eozoon, 

 and which in my judgment are really Laurentian coals, repre- 

 senting the vegetation of that period, as yet altogether unknown 

 to us in its forms and structures. 



(2.) A very interesting specimen, found last autumn by 

 Messrs. Richardson and Weston, at Petite Nation, has enabled 



