CHARACTERS OF FOSSIL CYCADITES. 
501 
Thus, we see that our fossil Cycadites are 
closely allied by many remarkable characters 
of structure, to existing Cycadeae. 
1. By the internal structure of the trunk, con- 
taining a radiating circle, or circles, of woody 
fibi’e, embedded in cellular tissue. 2. By the 
structure of their outer case, composed of persis- 
tent bases of petioles, in place of a bark ; and by 
^ill tlie minute details in the internal organization 
of each Petiole. 3. By their mode of increase by 
I^uds protruded from germs in the Axillae of the 
P etioles. 
However remote may have been the time when 
plates, resembling the double woody circle in the mature trunk, 
t*!' 61, 1, B, b. But in PI. 61, Fig. 2, the laminated circle 
"'ithin the embryo trunk near d, is less distinctly double, as 
•'Rght be expected in so young a state. 
At PI. 62, Fig. 3, d, and d', we see magnified representations 
a portion of the embryo circle within the Bud, PI. 61. Fig. 3, 'd. 
"I'hese woody circles within the buds, are placed between an 
®^terior circle of cellular tissue, interspersed with gum vessels, 
^iid a central mass of the same tissue, as in the mature stems. 
On the right of the lower bud, PI. 61, Fig. 3, above b, and in 
'^I'o magnified representation of the same at PI. 62, Fig. 3, e, we 
I'ave portions of a small, imperfect laminated circle. Similar im- 
perfect circles occur also near the margin of the sections, PI. 61, 
2, 3, at e, e, e" ; these may be imperfectly developed 
fiuds, crowded like the small Buds near the base of the 
living Cycas, PI. 58 : or they may have resulted from the con- 
fluence of the bundles of vessels, in the Bases of leaves, forced 
^ugether by pressure, connected with a diminution or decay of 
fiieir cellular substance. The normal position of these bundles 
'*1 vessels is seen magnified in PI. 62. Fig. 3. c. and in nearly 
ull the Sections of Bases of petioles in PI. 61 . Fig. 2. 
