240 Dr. H. A. Nicholson on the Occurrence 
The cellules are from three to six on a pinnule; when well 
exhibited, they are angular, projecting, and closely resem- 
bling the cellules in some forms of Graptolites Nilssoni, 
Barr. The test is corneous, and there are no traces of any 
solid axis. 
The entire frond is not known to me; but I have seen frag- 
ments of nearly two inches in length. Whether this species 
is absolutely distinct from that of the Quebec group, termed 
by Hall P. plumosus, it is difficult to say, in the absence of the 
cellules of the latter. It is, however, highly improbable that 
the species should have survived through a period of time so 
vast as this would imply. Our species, too, is of a much more 
slender and graceful habit than is the case with either of the 
American species, whilst the branching is more diffuse and the 
pinnulee are shorter. 
Loc. In a greenish-grey mudstone, of Lower Ludlow age, 
from Bow Bridge, near Ludlow. | 
Ptilograpsus anglicus, spec. nov. 
A small portion of a frond, natural size. 
A single branchlet, enlarged. 
A single pinnule, enlarged, to show the cellules. 
Branched Graptolite (Ptilograpsus?) from the Lower Ludlow rocks 
of Bow Bridge, near Ludlow, nat. size. 
A portion of the same, enlarged, showing pinnule and cellules(?). 
In the same bed with Ptlograpsus anglicus there occurs a 
branching fossil, in the same state of preservation as the former, 
and almost certainly Graptolitic, though I have failed to de- 
tect cellules except in one instance, and then not with cer- 
tainty. I possess, however, but a single specimen, which L 
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