PLATE IL 12, 13, 13^ 14. 
PLANTS, GRIT AND IRONSTONE. 
FIG. I, 2, 2 *. 
PHYTOLITHUS Plantites (verrucosus) trunco 
subcylindrico subramoso ; tuberculls suppressis quin- 
cuncialibus tecto, foliis confertis horizontalibus line- 
arl-lanceolatis. S. p, 
A fossil vegetable. The original a Plant. Trunk nearly 
cylindric ; but somewhat flatter on one side ; tubercled, 
leafy. The tubercles*, disposed in a quincunx order, and, 
generally, suppressed or sunk in small pits or hollows. 
Leaves -f- numerous, horizontal, llneari-lanceolate. On the 
flat side of the trunk, in most specimens, a deep longitudi- 
nal sulcus. 
The Internal structure of this fossil is singular. On break- 
ing the stone, a rough, imbricated body, of a slender, cylin- 
dric form, is frequently discovered immediately under the 
F 
* It is proper to remark, that the tubercles vary considerably in shape and 
size : they are sometimes large, close, and rounded ; at other times, as in 
specimen fig. 2, small and distant — In fig. 2^' they are only marked by a 
Small, impressed ring, in the centre of which rises a minute spine-like point. 
+ The leaves are very rarely distinguishable : I first traced them in some 
large' blocks of stone, lying on the sides of the high-road near Nether 
Padleyi a village between Bakewell and Sheffield. Those specimens, how- 
ever, were very imperfect : some in Mr. Watson’s possession at Bakewell, 
Collected, I believe, near Chesterfield, are much more compleat ; exhibiting 
the true form and situation of the leaves, which are inserted on every side of 
the stem, apparently one at each tubercle. 
