140 THE DAWN OP LIFE. 



which contain them hold also fragments of Eozoon, 

 and are not known to contain other fossils. 



"Til 



d TJ c a 



FIG. 35. Annelid Burrows, Laurentian or Huronian. 



Fig 1. Transverse section of Worm-burrow magnified, as a transparent object, 

 (a.) Calcareo-silicious rock. (6.) Space filled with calcareous spar, (c.) 

 Sand agglutinated and stained black, (d.) Sand less agglutinated and un- 

 coloured. Fig. 2. Transverse section of Worm-burrow on weathered surface, 

 natural size. Fig. 3. The same, magnified. 



If we now turn to other countries in search of con- 

 temporaries of Eozoon, I may refer first to some speci- 

 mens found by my friend Dr. Honeyman at Arisaig, in 

 Nova Scotia, in beds underlying the Silurian rocks 

 of that locality, but otherwise of uncertain age. I do 

 not vouch for them as Laurentian, and if of that age 

 they seem to indicate a species distinct from that of 

 Canada proper. They differ in coarser tubulation, 

 and in their canals being large and beaded, and less 

 divergent. I proposed for these specimens, in some 

 notes contributed to the survey of Canada, the name 

 Eozoon Acadianum. 



Dr. Gumbel, the Director of the Geological Survey 



