Seward. — On the genus Myeloxylon ( Brong .)» 9 
have another type of bundle, where the xylem-group, which 
is triangular in form, is still more or less central in position ; 
at the apex of the triangle some smaller tracheids are seen 
which suggest protoxylem. In all the vascular bundles of 
this specimen the parenchymatous cells immediately sur- 
rounding the xylem and the phloem-space are smaller than 
the ordinary cells of the ground-tissue. 
In Fig. 6 , a third bundle is represented in which the xylem 
has been very slightly displaced, and here again smaller 
elements indicate that the probable position of the proto- 
xylem is on the side of the xylem opposite to the phloem- 
space. Close to this bundle we have one of the fairly abundant 
canals ( c ) which are scattered through the parenchyma ; 
bordering the canal-cavity are some tangentially elongated 
cells, such as we find in mucilage-canals of recent Cycads. 
Another kind of bundle is shown in Fig. 7 ; the xylem is 
still attached to the parenchyma at one or two points, and, as 
usual, on the side next to the vacant space are seen tracheids 
of smaller diameter. 
The Parenchyma of the ground-mass appears to be made up 
of cells fairly uniform in size, except in the immediate neigh- 
bourhood of the vascular bundles, where the cells are marked 
off from the rest by their smaller size, and form a kind of 
indistinct sheath. Traversing the parenchyma are several 
canals : these are especially abundant towards the periphery 
of the section, but this may be due to the fact that the 
parenchyma towards the centre is much less perfectly pre- 
served. 
In Fig. 8, a patch of hypodermal tissue is shown ; the 
preservation is by no means perfect, but sufficiently good to 
enable us to recognise in the alternating groups of parenchyma 
and sclerenchyma the same type of structure so clearly seen 
in Renault’s figures of Myeloxylon radiata. 
In this transverse section (Fig. 3) I have not made out with 
certainty any groups of thick-walled elements, either in close 
proximity to the xylem-groups or in the ground-tissue, but 
there are indications that such elements were here and there 
