‘ THE DEVONIAN FOSSILS OF CANADA WEST. 257 
in length, from half an inch to more than one inch wide, and from 
one to three lines in thickness. The cells, when perfect, are trans- 
versely sub-oval or sub-triangular, usually with one curved and two 
straight sides, from half a line to two-thirds of a line wide; distant 
from each other about two-thirds of a line in the vertical, and a little 
less in the transverse direction of the frond. When well preserved, 
the lower lip, or edge of the cell, is thin, sharp, and uniformly 
arched. In the very thin fronds (one line in thickness), the cells 
open out on the surface at a very acute angle, apparently 15° to 20°; 
but in the thicker specimens the angle is greater—sometimes 45°. 
Locality and formation.—Bosanquet. Shales of the Hamilton 
Group. 
-Coillectors.—A. Murray, J. Richardson. 
ALVEOLITES squamosa.—N. Sp. 
Deseription.—This species is found in wide, flat, irregular expansions, 
sometimes six or seven inches in breadth, and from half an inch to 
one inch and a half in thickness; composed of successive, and often 
much distorted, layers; the cells opening out upon the surface very 
obliquely, and separated from each other by exceedingly thin parti- 
tions, which, when silicified and well brought out by the action of 
the weather, present a peculiarly rough squamose appearance. The 
cells are linear, in general about half a line in length, and apparently 
one-tenth of a line in width. One of the specimens examined ex- 
hibits two spots, one-fourth of an inch wide each, where the cells are 
less than half the average size. There are obscure indications of a 
central ridge on one side of the cell in this species, as there is in 
A. suborbicularis.. 
This species differs from 4. Goldfussi in having much smaller and 
more compressed cells. In a space one-fourth of an inch square, I 
have counted ninety-seven cells ; and the average appears to be from 
seventy-five to one hundred, with here and there spots holding double 
that number. In 4. Goldfussi there are from sixteen to thirty in the 
same area. On comparing the figures of A. suborbicularis in the 
works of Go-pruss, SANDBERGER, and Brown, it will be seen that 
in that species there are about fifty cells in one-fourth of an inch 
Square. The difference in the size (great though it be) might not be 
sufficient to separate these three species, but the form of the cells 
appears to be also different. 4. Goldfusst has not the groove on the 
