160 THE MEDALS OF CREATION. Cnap. VI. 
The stem of the Clathraria is composed of a solid internal 
axis, the surface of which is covered with reticulated fibres ; 
the large branched specimen of this 
part, figured in Lign. 52, is the finest — 
example hitherto obtained: it was dis- ij 
covered, with bones of the Iguanodon, — 
in a quarry near Cuckfield, Sussex, in 
1820. The axis is invested with a very 
thick false-bark, formed of the consoli- — 
dated bases of the leaf-stalks, the in- — 
sertions of which are rhomboidal and — 
transverse. The outer surface of the 
bark is consequently marked with ele- 
vated lozenge-shaped cicatrices (Lign. 
53), separated from each other by a 
marginal furrow, which is surrounded 
by a parallel ridge or band of a fibrous 
structure. 
The cortical zone is generally con- % 
verted into a cylinder of stone, which 
in some examples separates from the 
axis. In a beautiful specimen of this 
“inet 
wh 
2 
eo ee ea eee 
Lien. 53. kind, Lign. 54, the axis projects and 
CraTHRARIA TYELEIT: is surrounded by the false-bark. : 
4 2 . . : . : 
A stem, with rhomboidal The axis is solid, and has its sur- © 
transverse scars, left by the Is : ° 
Se peoken Goanevseaely face strongly marked with interrupted 
and separated, to show the ridges. This surface has generally 
internal axis at @, which, if ich tarts dhevinale 
the pieces were united, would patches 0 vascular tissue adhering to 
be received in the cavity jt ; and there are here and there deep 
below. The depression, or. l hit oe 
cicatrix, on the middle of the pits, or lacune, which provavly con- 
upper portion, 6, was pro- tained a resinous secretion. Thin 
bably the situation of a resin- : 
ous secretion, like thedragon- transverse sections of the axis, pre- 
blood in the Draczna. pared with Canada balsam, and exa- 
mined under the microscope, only give faint traces of 
cellular tissue. 
POSING pt SO Fa 
SRR g Gs eR eet EEE: 
