CONTEMPORARIES AND SUCCESSORS OF EOZOON. 



135 



oval in outline, about tliree inches in lengtli,, wholly 

 made up of rounded or cylindrical cells, tlie walls of 

 whicli have a beautiful tubular structure, but there is 

 little or no supplemental skeleton. Whether this is 

 a portion accidentally broken off from the top of a 

 mass of Eozoon, or a peculiar varietal form, or a dis- 



FiG. 31. AcervuUne Variety of Eozoon, St. Pierre. 



(7.) General form, half natural size. (&.) Portion of cellular interior, magnified, 

 showing the course of the tubuli. 



tinct species, it would be difficult to determine. In the 

 meantime I have described it as a variety, '' acervu- 

 liiia/' of the species Eozoon Canadense.* Another 

 variety also, from Petite Nation, shows extremely thin 

 laminse, closely placed together and very massive, and 

 with little supplemental skeleton. This may be allied 

 to the last, and may be named variety '' minor.'' 



All this, however, has nothing to do with the layers 

 * Proceedings of Geolojical Society, 1875. 



