Article I . — Eozoon in Laurentian Rocks, 
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of the limestone on the south side of Lily Lake containing 
serpentine. In this limestone Sir William found Eozoon in a 
fragmentary condition. 
Sir William, in his work on Eozoon, Life’s Dawn on 
Earth, p. 235, described the Canadian species as occurring in 
rounded masses, or thick, encrusted sheets, frequently of large 
dimensions. The typical structure was said to be stromato- 
poroid, or with concentric calcareous walls, frequently uniting 
together, etc., etc. 
I have lately met with an article by Sir Wm. Dawson, 
(Geol. Mag., Lond., vol. Y. of series III,, Eeb., 1888), in 
which he gives new facts on Eozoon, and modifies his descrip- 
tion of the form of this fossil. 
‘‘1. Form of Eozoon Canadense . — Hitherto this has been 
regarded as altogether indefinite, and it is true that the speci- 
mens are often in great confluent masses, or sheets, the latter 
often distorted by the lateral pressure which the limestone 
has experienced. The form from Tudor, however, figured by 
Sir W. E. Logan (in Quart. Jour. Geol. Soc., Lond., 1866, p. 
253, and described by me, ^ ^ ^ and figured by me 
in my work. Life’s Dawn on Earth), gave the idea of a 
turbinate form, more or less broad. More recently additional 
specimens, weathered out of the limestone of Cote St. Pierre 
* * * compared with several less perfect specimens in our 
collections, have established the fact that the normal shape 
of young and isolated specimens of E. Canadense is a broadly 
turbinate, funnel shaped or top-shaped form ; sometimes 
with a depression on the upper surface, giving it the appear- 
ance of the ordinary cup-shaped Mediterranean sponges. 
These specimens also show that there is no theca or outer coat 
either above or below; and that the laminae pass outward 
without change to the margin of ‘the form, w^here, however, 
they tend to coalesce by subdividing and bending together. 
The laminae are thickest at the base of the inverted cone, and 
become thinner and closer on ascending, and at the toje they 
become confounded into a general vesicular or acervuline 
layer. I now feel convinced that broken fragments of this 
upper surface, scattered over the sea-bottom, form those 
