542 ROBERT KIDSTON ON FOSSIL PLANTS 
parallel to the contour of the scar, having a sharply inflected notch at its upper 
extremity. 
Remarks.—The specimen is five and a quarter inches long and one inch 
broad, but appears to have been originally broader. 
The upper part of the fossil is covered by a smooth carbonaceous film, which 
probably represents the outer surface of the bark. 
At first sight one would take this plant for a species of Stigmaria, but from 
the form of the scars and the shape of the vascular bundle impression, it must 
be placed in Cawlopteris, as that genus is at present defined. Only one specimen 
has been obtained. 
Position and Locality—¥rom the Cement-stone group of the Calciferous 
Sandstone series, Kershope Burn, Liddesdale. 
EQUISETACEA. 
Volkmannia, Sternb. 
Volkmannia, sp. 
I have placed under this name a specimen containing several small cones 
referable to the Calamites. 
The cones are an inch and quarter to an inch and three-quarters in length, 
and about the fifth of an inch in width. 
They spring from a common stem, to which they are attached by stalks 
about three-quarters of an inch long. 
The little bracts bearing the sporangia arise from the axis of the cone at 
right angles, but as to how many bracts may have formed a whorl, I am unable 
to determine. 
These cones resemble Volkmannia sessilis, Presl., and Calamodendron 
commune Binney, in the verticillate manner in which they spring from the main 
stem and in the arrangement of the bracts round the axis of the cone, but 
differ from them in being longer and proportionately narrower. 
These two genera are included by some authors in Paleostachya, Weiss, but 
I have used the genus Volkmannia in preference, as it means little more now 
than the cone of a Calamite, 
This appears better than placing it in a restricted genus, from which it 
would probably require to be removed, when more perfect examples have been 
examined. 
Position and Locality —F¥rom the Cement-stone group of the Calciferous 
Sandstone series, Glencartholm, Eskdale, 
