196 
Fig. 1. 
Fig. 2. 
Fig. 3. 
A EUROPEAN PETRIFACTION WITH FOLIAGE. 
EXPLANATION OF THE PLATES. 
(All photographs entirely untouched.] 
PLATE 19. 
Photograph of transverse section, natural size. Out from level m (see text-fig. 1), 
showing the small axis of the trunk surrounded hy leaf-bases. 
Photograph of transverse section about once-and-a-half times natural size, Cut 
from level p (see text-fig. 1), showing clearly the oval pith surrounded by the 
oval vascular cylinder of the axis, broken by the leaf-traces. Attached and 
associated leaf-bases surround the cortex, 
Photograph of the old longitudinal section of the upper part of the axis and leaf- 
bases, natural size. 
Vig. 4. Photograph of part of the pith from the lowest section of the axis, level r, text- 
Fig. 5 
Fi. 6 
Ina 7. 
Fig. 8 
Fig. 9 
Fig. 10 
Fig. 11 
Fig. 12 
fig. 1, showing the normal tissues of the pith and also the greater part of the 
circle of unusual tissue, supposed * separation layer" s. The central cells of this 
circle of tissue are much decomposed. 
. Photograph of about half of the mass of large thick-walled ramenta forming a 
pseudo-leaf-base area, b, and part of a second such, b', these are separated bv 
drifts of small-celled ramenta, zr. 
- Small part of a leaf-base much enlarged, showing epidermis with thick cuticle, 
here appearing as a dark line c, broken by the insertion of a ramentum. Compare 
with text-fig. 2. 
PLATE 20, 
Photograph of rachis, showing its horse-shoe shaped vascular bundle, On the 
right a few pinnie are attached to the rachis. 
. Photograph of a group of pinne surrounded by ramenta. 
. Photograph of part of a similar group of pinne further enlarged. Between each 
leaflet (2) a zone about the thickness of each leaflet can be seen (z). This should 
be compared with fig. 11 and text-fig. 3. 
. Photograph of corner of one of the pinne, showing the heavily thickened hypoderm 
at the corner, the bundle-sheaths, etc. 
. Photograph of the corners of two pinnz (J) showing clearly the tissue-like weft of 
hairs (2) growing from the lower surface of each leaflet and packing spaces 
between them about the size of the leaflets themselves, Compare this with 
text-fig. 3 and ulso with fig. 9, . 
. Photograph of part of a closely folded leaf, taken through the middle parts of the 
pinnæ where they have less thickened tissues, and where the pinne lie closely 
packed without the wefts of hairs between each. Note how near together the 
vascular bundles lie. Note also the contrast between the character of the leaflets 
here and in fig. 11. Compare this with text-fig. 4. 
(For photographs 1, 2, & 3, Plate 19, I am indebted to the skill of Mr. I’. Pittock 
of University College: the others I took myself. ] 
