25 
ae 
‘septa and filled up interseptal loculi with the dissepiments of the first-mentioned series. In this 
way is produced a succession of vertical ridges and intervening sulci crossed by numerous 
curved or sharply-zig-zagged encircling ridges, 
The species of Heliophyllum which have been described by Mr. Billings as occurring in 
the Devonian Rocks of Canada are H. Hriense, H. Cayugaense, H. Canadense, H. colligatum, 
Hi exiguum, H. Halli, and H. tenuiseptatum, the first five from the Corniferous formation, and 
the last two from the Hamilton Shales. All of these, except H. tenuiseptatum, have come 
under my notice as occurring in the Corniferous Limestone of Western Ontario; and I have 
also some new forms to record. 
15, HELIOPHYLLUM CANADENSE (Billings). 
(Plate V. Fig. 1.) 
Heliophyllum Canadense.—Billings, Canadian Journal, new series, Vol. IV. p. 125. 
i Corallum simple, turbinate. Septa between eighty and ninety at a diameter of an inch 
and a half, carrying on their flat surfaces strong arched strize at distances of from two-thirds 
of a line to one line, and on their free edges blunt spines placed at similar distances. Hpitheca 
with strong sharp-edged encircling folds and annulations of growth. ‘In the bottom of the 
cup the septa reach the centre, and are there twisted together so as to form a somewhat solid 
elevated pseudo-columella, around which there is a deep space occupied only by the septa.” 
(Billings). 
Dimensions varying from two inches up to half a foot or more in length. One specimen 
in a perfect state of preservation measured two inches and a half along its convex curvature, 
and one inch and\a quarter along its concave curvature, the diameter of the cup being a little 
over an inch and a half; and other specimens are still more broadly expanding. This is, 
perhaps, the commonest species of Heliophyllum in the Corniferous Limestone of Western 
Canada. It is closely allied to HW. Cayugaense (Billings) and H. Halli (Edwards and Haime) ; 
differing from the former chiefly in not having a smooth space at the bottom of the cup, and 
in the fact that the arched septal strize are on the whole a little nearer together; whilst it is 
distinguished from the latter by its generally smaller dimensions, and by having the septal 
Spines and strize more remote. 
According to Mr. Billings, the epitheca is sometimes smooth, and there appears to be a 
septal fossette. 
Locality and Formation.— Corniferous Limestone, Port Colborne; Lot 6, Con. 1, Wain- 
fleet; and other localities in Western Ontario. 
16. HeLiopHyLLUM COoLBORNENSE (Nicholson. 
(Plate V. Fig. 4.) 
Heliophyllum Colbornense, (Nicholson) “ Canadian Naturalist,” Vol. VII. No. 3, 1873. 
Corallum simple, cylindrical, not expanding towards the calice. Septa sixty at a diameter 
of one inch, carrying on their flat surfaces arched strize at distances of from one-third to half 
aline. Epitheca with numerous rounded or sharp-edged constrictions and annulations of 
erowth. A flat space at the bottom of the cup, to the centre of which the septa extend. Cup 
deep; fossette unknown. 
This species is nearly related to H. Cayugaense and H. Canadense (Billings) ; but it is, I 
think, decidedly distinct. It is distinguished from H. Canadense by its cylindrical and not 
broadly expanding form, the cup being equal to or less than the diameter of the coral at a 
point apparently a little above the base, by the flattening of the bottom of the calice, by the 
smaller number of septa, and by the greater closeness of the arched septal strie. From H. 
Cayugaense, the present species is distinguished by its much smaller thickness, its cylindrical 
but not expanding form, the smaller number of septa, and the closeness of the septal strize. 
The length of H. Colbornense must have been over three or four inches, but none of my 
specimens are perfect. The dimensions of a broken individual are: length two inches and a 
half ; diameter of broken base one inch; diameter of cup ten lines; depth of cup four lines. 
In another, also broken, specimen, the length is two inches and a quarter ; the diameter at the 
