10 
MUSEUM BULLETIN NO. 5. 
ation products of the wall distributed along minute cracks in 
the calcite which fills the cells. 
While descriptions of Beatricea nodulosa and B. undulata do 
not specifically describe the three zones, yet an inspection of the 
macroscopic character of specimens from Anticosti shows that 
both the outer or “sheath” zone and the axial tube are present 
in well preserved specimens, and certain of them indicate the 
presence of a “clear” zone as well. Parks, in his “Ordovician 
Stromatoporoids,” 1 thus describes a section of j B. undulata , 
which, unfortunately, he does not figure: “This specimen is 75 
mm. thick and presents in cross section a series of concentric 
layers of very different aspect. The inner tube has a radius of only 
3 mm. This is surrounded by a ring, 20 mm. thick, of ordinary 
vesicular tissue with the granular element well developed, but 
with scarcely a trace of radial pillars. Surrounding this ring 
is an outer zone, 15 mm. thick, which is fairly well demarked 
by a sharp line of separation. This outer layer is strikingly 
different from the middle annulus, being composed of continuous 
laminae and well marked radial pillars.” 
Parks does not state that his inner tube, only 3 mm. in 
radius, has a distinct wall, and as he copies Nicholson’s figures, 
where such a wall is absent, we are inclined to think that both 
his inner tube and the 20 mm. thick band of vesicular tissue 
around it are to be correlated with the “inner tube” of C. anti- 
quatus. The outer band is probably the same as our “sheath” 
zone, and there is apparently no “clear” zone present. 
Some of Nicholson’s sections seem to have been cut from 
the “sheath” zone of B. nodulosa , for he states in a footnote 
that in one section he noticed perpendicular calcareous septa 
crossing the vesicles. The relation of the present form to 
Beatricea is now being studied by the writer, and will probably 
be set forth in a later paper. 
The photographs which illustrate this article were, with 
the exception of figure 2, Plate I, made at the Geological Survey of 
Canada and all the types are in the collections of this Survey. 
Except where otherwise noted, the specimens are from the 
locality in Carden. 
l Univ. of Toronto Studies, Geological Series, No. 7, p. 44, 1910. 
