CONTEMPORARIES AND SUCCESSORS OF EOZOON. 149 



World, but applies to Europe as well, and Europe lias 

 furnished a successor to Eozoon in the later Eozoic or 

 Huronian period. In rocks of this age in America, 

 after long search and much slicing of limestones, I 

 have hitherto failed to find any decided organic re- 

 mains other than the Tudor and Madoc specimens of 

 Eozoon. If these are really Huronian and not Lau- 

 rentian, the Eozoon from this horizon does not sensibly 



FIG. 37. Section of Eozoon Bavaricum, with Serpentine, from the 

 Crystalline Limestone of the Hercynian primitive Clay -state Formation 

 at Roheiiberg ; 25 diameters. 



(a,.) Sparry carbonate of lime. (6.) Cellular carbonate of lime, (c.) System of 

 tubuli. (d.) Serpentine replacing the coarser ordinary variety, (e.) Serpen- 

 tine and hornblende replacing the finer variety, in the very much contorted 

 portions. 



differ from that of the Lower Laurentian. The curious 

 limpet-like objects from Newfoundland, discovered by 

 Murray, and described by Billings,* under the name 

 Aspidella, are believed to be Huronian, but they have 

 no connection with Eozoon, and therefore need not 

 detain us here. 



Leaving the Eozoic age, we find ourselves next in the 

 Primordial or Cambrian, and here we discover the sea 

 * Canadian Naturalist, 1871. 



