214 Canadian Record of Science. 
of Archeospherine. It is a small or young specimen, 
of a flattened oval form, 25 inches in its greatest 
diameter and of no great thickness. It is a perfect 
cast in serpentine, and completely weathered out of the 
matrix, except a small portion of the upper surface, which 
was covered with limestone which I have carefully remov- 
ed with a dilute acid. The serpentinous casts of the cham- 
bers are in the lower part regularly laminated; but they 
are remarkable for their finely mammilated appearance, 
arising from their division into innumerable connected 
chamberlets resembling those of Archeospherine. In the 
upper part the structure becomes acervuline, and the cham- 
berlets rise into irregular prominences, which in the recent 
state must have been extremely friable, and, if broken up 
and seattered over the surfaces of the beds, would not be 
distinguishable from the ordinary Archeospherine. This 
specimen thus gives further probability to the view that the 
Archeospherinz may be for the most part detached cham- 
berlets of Eozoon, perhaps dispersed in a living state and 
capabie of acting as germs. Other specimens weathered 
out and showing granular forms have been collected by Mr. 
K. H. Hamilton and are now in the Museum. 
6. Specimens of Eozoon have been traversed by veins of 
chrysotile and calcite which cross all their structures indif- 
ferently, and often seriously affect their preservation. But 
similar accidents have affected fossils of every age, and es- 
pecially those of the older and more altered rocks. The 
Fig, 10. Chrysotile vein‘crossing Hozoon, magnified. (a) Vein of fibrous Serpen- 
tine or Chrysotile; (6) Tubulation of Eozoon. 
