260 THE DEVONIAN FOSSILS OF CANADA WEST. . 
FPF. Gorauanpica and F. HEMISPHERICA. 
Both of these species occur in the Hamilton Group, at Bosan- 
quet ; the former in dome-shaped masses, from three inches to a 
yard in diameter, with cells about one line and a half wide: the 
latter in somewhat flat, undulating expansions, from three inches to 
one foot or more in width, and from less than one to three inches in 
thickness. In some specimens of the latter, the cells are half a line 
wide, or thereabouts, and of an uniform size all over the whole sur- 
face ; but in others there are numerous spots where the cells are 
only one-fourth of a line in width. In this respect the specimens 
from the Hamilton Group agree exactly with those of the Corni- 
ferous Limestone. 
DiIpHYPHYLLUM ARCHIACI.—N, Sp. 
Fig. 8. 
Fig. 8. Diphyphyllum Archiaci. 
Description.—Corallum forming large masses of parallel nearly 
straight cylindrical stems, in contact with each other, or nearly so, 
and which, when full grown, are from six to eight lines in diameter. 
The young stems are added by lateral or marginal gemmation, and 
are at first two or three lines in diameter, their adult size being at- 
tained at the length of two or three inches. At the diameter of 
four or five lines, there are between thirty and thirty-five radiating 
septa; at six or eight lines, usually about fifty ; but occasionally in 
those of the larger size, from seventy-five to eighty may be seen. 
