38 
Bulletin of Natural History Society. 
layers of Arcliceosjoherinoe which I at one time regarded as^ 
distinct organisms.” 
“ It is to be observed, however, that other forms of Eozoon 
occur. More especially there are rounded or dome-shaped 
masses, that seem to have grown on ridges or protuberances, 
now usually represented by nuclei of pyroxine.” 
The above remarks may be considered to embody the 
result of Sir Wm. Dawson’s matured studies on the form of 
Eozoon Canadense, and show very clearly its distinctness 
from the calcareous object 1 describe below. The broad 
top-shaped or funnel-shaped form of the Eozoon implies 
the possession of concave rather than convex partitions 
(laminae); but hundreds of examples of the Acadian fossil 
show that the normal shape of its layers is convex. 
Some months since the attention of the writer of this 
communication was called by Mr. Wm. Murdoch, C. E., of St. 
John, to the appearance of some fragments of crystalline 
limestone, which were thought to be pieces of petrified wood. 
The fragments had been broken from ledges, at a locality which 
from his knowledge of the local geology, the writer knew to 
be from the upper series of the Laurentian area near St. 
John, N. B. 
These fragments had apparently a concretionary structure, 
but differed from any concretionary limestone the writer had 
seen before. The pieces exhibited were not sufficient to show 
the nature or origin of these apparent concretions, and an 
early opportunity was embraced of visiting the locality and 
making observations on the spot. This visit resulted in the 
discovery of an extensive reef of limestone, in which immense 
numbers of these peculiar fossils are preserved in a remarkably 
perfect condition. 
The reef began its growth on a bottom of fine sand, now 
converted into a quartzite rock which forms an important 
member of the Upper Series. There the objects consist of a 
multitude of small, short, closely set columns, which grew 
tier upon tier, with at first more or less of sand between the 
tiers. 
