CONTExMPORARIES OF EOZOON 



213 



which is to be regarded as a distinct species, or at 

 least a well-marked varietal form, he has named 

 Eozoon Bavariann (Fig. 56). Thus this early intro- 

 duction of life is not peculiar to that old continent 

 which we sometimes call the New World, but 

 applies to Europe as well, and Europe has fur- 

 nished a successor to Eozoon in the later Eozoic or 



Fig. 56. — 6"(r//.7/ of Eozoon Bavaricwfi, ^vith Serpentine, from the 



Crystalline Limestone of the Hercynian primitive Clay-slate 



Formation at Hohenberg ; 25 diameters {probably Huronian). 



{a) Sparry carbonate of lime, (b) Cellular carbonate of lime, (c) System of tubuli. 

 {d') Serpentine replacing the coarser ordinary variety, (e) Serpentine and horn- 

 blende replacing the finer variety, in the very much contorted portions. 



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 foramini- 

 feral remains other than the Tudor and Madoc 

 specimens, which may be of this age. They are 

 laminated forms resembling Eozoon, but I have 

 reason to believe that their minute structure more 



