﻿70 



Canadian Record of Science. 



removed, the calcareous portion would form a continuous 

 skeleton, while the serpentine filling the chambers, when 

 the calcareous plates are dissolved out by an acid, forms a 

 continuous cast of the animal matter filling the chambers. 

 This cast of the sarcodous material, when thus separated, 

 is very uniforndy and beautifully mammillated on the 

 surfaces of the lamiuce, and this tuberculation gradually 

 passes upward into smaller chambers, having amoeboid 

 outlines, and finally into rounded chamberlets. It is also 

 a very constant point of structure that the lower laminae 

 of calcite are thicker than those above, and have the 

 canal-systems larger and coarser. There is thus in the 

 more perfect specimens a definite plan of structure on 

 the large scale. 



Fig. 6. — Diagram of typical mode of arrangement of canals and tubuli 

 in a lamina of Eozoon Canadense. (Magnified. ) 



The normal mode of mineralization at Cote St. Pierre 

 and Grenville is that the laminae of the test remain as 

 calcite, while the chambers and larger canals are filled 

 with serpentine of a light green or olive color, and the 

 finer tubuli are injected with dolomite. It may also 

 be observed that the serpentine in the larger cavities 

 often shows a banded structure, as if it had been deposited 

 in successive coats, and the canals are sometimes lined 

 with a tubular film of serpentine, with a core or axis of 

 dolomite, which also extends into the finer tubuli of the 

 surfaces of the laminae This, on the theory of animal 

 origin, is the most perfect state of preservation, and 



