On Specimens of Eozoon Canadense. 221 
composed of its finer subdivisions placed close together, so 
as to become approximately parallel. (See Fig. 4 above.) 
(5.) Nodules of Serpentine. 
Reference has been made in previous papers to the 
nodules and grains of serpentine found in the Kozoon lime- 
stone, but destitute of any structure. These nodules, as 
exhibited in the large slabs already referred to, have how- 
ever often patches of Hozoén attached to or imbedded in 
them, and they appear to indicate a superabundance of this 
siliceous material accumulating by concretionary action 
around or attached to any foreign body, just as occurs with 
the flints in chalk. The layers and grains of serpentine 
parallel to the bedding appear to be of similar origin. 
(6.) State of Preservation. 
Recent observations more and more indicate the impor- 
tance and frequency of dolomite as a filling of the canals, 
and also the fact that the serpentine deposited in and around 
the specimens of Eozoon is of various qualities. Dr. Sterry 
Hunt has shown that the purely ayueous serpentine found 
in the Laurentian limestones is of different composition from 
that occurring with igneous rocks, or as a product of the 
hydration of olivine. There are, however, different varieties 
even of this aqueous serpentine, ranging in colour from 
deep green to white; and one of the lighter varieties has 
the property of weathering to a rusty colour, owing to the 
oxidation of its iron. These different varieties of serpentine 
will, it is hoped, soon be analysed, so as to ascertain their 
precise composition, The mineral pyroxene, of the white 
or colourless variety, is a frequent associate of Eozoon, 
occurring often in the lower layers and filling some of the 
canals. Sometimes the calcareous lamin themselves are 
partially replaced by a flocculent serpentine, or by pyroxenic 
grains imbedded in calcite. 
