198 RELICS OF PRIMEVAL LIFE 



instances it would appear that the calcareous matter 

 of fragments of Eozoon has been in part replaced by 

 serpentine." 



[I may add here that in the limestone at Cote St. 

 Pierre there are in some of the beds successive 

 laminae with grains of serpentine and others with 

 crystals of dolomite, and that both contain fragments 

 of Eozoon. It thus seems as if the magnesia as- 

 sociated with the limestone, at some stages of 

 deposition took the form of silicate, and in others 

 that of carbonate. I may also observe here that I 

 have detected fragments of Eozoon in Laurentian 

 limestone from New Brunswick, from Chelmsford in 

 Massachusetts, from Warren County, New York, from 

 Brazil, and from the Alps.] 



"(2) Intermixed with the fragments of Eozoon 

 above referred to are other calcareous matters appar- 

 ently fragmentary. They are of various angular and 

 rounded forms, and present several kinds of structure. 

 The most frequent of these is a strong lamination 

 varying in direction according to the position of 

 the fragments, but corresponding, as far as can be 

 ascertained, with the diagonal of the rhombohedral 

 cleavage. This structure, though crystalline, is highly 

 characteristic of crinoidal remains when preserved in 



