CHARACTERS OF FOSSIL CYCADITES. 501 
Thus, we see that our fossil Cycaclites 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 
fibre, 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 
all the minute details in the internal organization 
of each Petiole. 3. By their mode of increase by 
Buds protruded from germs in the Axillse of the 
Petioles. 
However remote may have been the time when 
plates, resembling the double woody circle in the mature trunk, 
PI. 61, 1, B, b. But in PI. 61, Fig. 2, the laminated circle 
within the embryo trunk near d, is less distinctly double, as 
might be expected in so young a state. 
At PI. 62, Fig. 3, d, and^d', we see magnified representations 
of a portion of the embryo circle within the Bud, PI. 61 . Fig. 3, 'd. 
These woody circles within the buds, are placed between an 
exterior circle of cellular tissue, interspersed with gum vessels, 
and 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 
the magnified representation of the same at PI. 62, Fig. 3, e, we 
have portions of a small, imperfect laminated circle. Similar im- 
perfect circles occur also near the margin of the sections, PI. 61, 
Figs. 2, 3, at e, e , e" ; these may be imperfectly developed 
Buds, 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 
together by pressure, connected with a diminution or decay of 
their cellular substance. The normal position of these bundles 
of vessels is seen magnified in PI. 62. Fig. 3. c. and in nearly 
all the Sections of Bases of petioles in PI. 61. Fig. 2. 
