. THE DEVONIAN FOSSILS OF CANADA WEST. 259 
pointed extremity usually curved, but occasionally straight ; more 
or less rapidly expanding upwards ; sometimes so much elongated as 
to become irregularly cylindrical ; several inches in diameter, and 
(though rarely) two feet in length. The more common length is 
from two to six inches. But the most remarkable character is, that 
Fig. 7. 
Fig. 7. Fawosites turbinata.—A small curved specimen. a: exhibits the different. 
appearances of the cells. 
the whole surface, except the larger end, is covered with a thick 
epitheca, which completely closes all the tubes. In general, the 
substance of the epitheca only fills the mouth of the tube, but leaves 
the walls so far visible that the polygonal form of the cells can be 
distinctly seen. In such specimens, the disc which closes the mouth 
of the corallites sometimes retains the impressions of the radiating 
septa, and thus presents an obscurely stellate appearance. There 
are some with an epitheca so thick, that it not only fills the cells but 
also entirely conceals the walls, so that the whole mass exhibits an 
uniformly smooth surfrace. 
In the original description, the corallites are said to be “ usually 
somewhat Jess than a line in width.” In one of the specimens from 
the Hamilton Group, the cells are, upon an average, full one line in 
diameter, with here and there one nearly a line and a half wide ; 
and no doubt others will be found still larger, for in all the species 
of Favosites this character is somewhat variable. The description, 
therefore, should state that the cells are about one line in width, 
a little more or less. This species is now known to occur in the. 
Oriskany Sandstone, the Corniferous Limestone, and in the Hamil- 
ton Shales. I have ascertained that there are one, two, or three 
rows of pores; usually two. 
