THE DEVONIAN FOSSILS OF CANADA WEST. 261 
Fifty appears to be the common number. There are two or three 
transverse diaphragms in one line. In most of the corallites there 
is a central area, one line or a little less in diameter, into which the .- 
radiating septa do not penetrate. Others in the same mags seem to 
be without this central area. Surface with a somewhat thick 
epitheca, which, where perfectly preserved, is beautifully ornamented 
with fine crowded, encircling strie, from fifteen to twenty in the 
‘width of one line. In addition to these fine striz, there are nume- 
rous usually sharp-edged annulations, varying from less than one- 
fourth of a line in width and depth, to one or two lines. Some of 
the corallites exhibit sudden constrictions of growth, which give to - 
them the appearance of a series of short turbinate stems inserted 
into each other. 
The epitheca is often entirely or partially worn away, and the fine 
strie can only be seen when the surface is in a very perfect state of 
preservation. 
It is probable this coral occurs simple as well as aggregate. 
Variety.—A. fragment from Lot No. 2, Con. 4, Townsend, three 
inches and a half in length and seven lines in diameter, and with 
about fifty radiating septa, appears to belong to this species, but 
differs in having the surface with only five encircling strie to one 
line. Resembles Cyathophyllum cespitosum (Goldfuss) ; but that is 
a smoother species, and, according to McCoy, only four or five lines 
in diameter, 
Locality and formation.—Lot 25, Con. 5, Bosanquet. Hamilton 
Shales. 
Collectors.—A, Murray, J. Richardson. 
HELIOPHYLLUM EXIGuUM.—J. Sp. 
Fig. 9: Fig. 10. 
Fig. 9. Heliophyllum exiguum.—Side view. Fig. 10. The same.—View of the cup. 
Deseription.—Small, turbinate, more or less curved, often flattened 
on the side of the convex curvature, radiating septa between sixty 
and eighty ; about six obseure arched striz to one line on their flat 
sides, and the same number of spines on their edges. The depth of 
