548 
BULLETIN OF THE NATURAL HISTORY SOCIETY. 
three inches across, and several inches in length (described further 
on as Arclicieozoon Acadicuse) . The object consists of a cumu- 
lative growth of conical partitions, layer upon layer, building up 
a cylindrical body that in cross-section looks not unlike a part 
ot a tree-trunk, and which bears a general resemblance to 
Stromatopora rugosa, Hall. The upper limestone, at the base 
of which this organism is found, has suffered greatly from 
denudation, as we find areas of the ‘ Upper Series ’ which do 
not appear to have the upper limestones. Good examples of the 
fossil are known only from one locality.” 
The part of the article on “ Eozoon and other low organisms 
at St. John,” referring to Archaeozoon, is as follows : 
“ Some months since the attention of the writer of this com- 
munication 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 frag- 
ments had been broken from ledges at a locality (‘ Green Head’) 
in the Upper Series of the Laurentian area (of rocks) 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 con- 
dition. 
“ The reef began its growth on a bottom of fine sand, now 
converted into a quartzite rock, which forms an important part 
(member) of the ‘ Upper Series.’ There (at the bottom of the 
reef) the object consists of a multitude of small, short, closely set 
columns, which grew tier upon tier, with at first more or less 
sand between the tiers. 
“ It may be observed, also, that these crowded clusters of 
columns were often cut off over considerable areas by thin 
horizontal layers of (amorphous) mineral matter, perhaps indi- 
cative of the incursion of (fine) sand or other sediment, but the 
