99 
EXPLANATION OF PLATE 62. 
Figs. 2, 3. Vertical sections of agatised Petioles, com- 
posing the false bark on the trunk of Cycadites 
microphyllus, and of embryo Buds. In the bud, 
Fig. 2. d. the division between the two woody circles 
is not distinct. In Fig. 3. 'd. it is very obvious j but 
the intermediate circle of cellular tissue is repre- 
sented only by a 6ne line. See V. I. p. 498, Note, 
and p. 600, Note. (Original.) 
In the sections of PI. 61, Figs. 2, 3, and PI. 62, the 
following letters are used to indicate the same parts, a, 
cotton, or down; h, integument of petioles or scales; c, 
bundles of vessels ; d, woody circles ; e, imperfect woody 
circles ; f, cellular tissue ; g, embryo bud ; h, gum ves- 
sels.* 
Plate 62. V. I. p. 498, Note. 
Fig. 1. Longitudinal section of a Petiole of Zamia spi- 
ralis magnified two times. It exhibits four bundles 
of vessels passing longitudinally through the cellular 
tissue, which is interspei'sed with gum vesssls. V. 
1. p. 499. (Original.) 
A. Transverse section of Fig. 1. magnified, and showing 
the irregular disposition of the bundles of vessels. 
(Original.) 
c. Magnified view of one of the bundles of vessels at 
A, c. (Original.) 
c". Magnified transverse section of a bundle of ves- 
sels in the petiole of Zamia horrida. (Original.) 
2. Longitudinal section of a portion of an agatised 
petiole of Cycadites microphyllus, from Portland, 
Magnified four times. The down or cotton at a, is 
me hcautifiil and instructive sections were presented to 
by AVitliani, being portions of a trunk w'hicb I liad placed 
Ibs disposition. 
