50 = sod. W. Dawson—Fossil Woods from British Columbia. 
which was large, has entirely disappeared, its place being 
occupied by structureless calcite. 
(2) Petiole.—This is a slightly flattened cylinder, two centi- 
meters in diameter. Externally it has a ae bark of small 
elongated cells, arranged in little groups in a radial manner. 
Within this is a continuous tissue of hexagonal adhere interspersed 
with what seem to be gum or proper juice-cells, darker in color, 
and each enclosed in a sheath of smaller cells. This cellular 
substance is traversed by about 45 bundles of fibers, presenting 
in the cross section a somewhat Hippocrepian arrangemen 
Thirty of these bundles, in the cross section, form a circle a 
little within the bark—the larger bundles being at the lower 
side. At the upper side is one bundle larger than those in its 
vicinity and of a round form, and from either side of this the 
remaining bundles form a deep loo op extending considerably 
beyond the center of the petiole. Hach bundle consists of fine 
fibers radially arranged and coarser outside, and with these are 
from one to five lacunze, which in the longitudinal section seem 
to be oval intercellular spaces. The fibers show in places a 
delicate transverse or pseudo scalariform marking similar to 
cads. 
(3) Leaves. fas have the structure well preserved, though 
in a fragmentary condition. The fragments are pease -sided, 
about half an inch wide, thick, and ‘traversed by strongly de- 
veloped parallel fibrous bundles, imbedded in detente cellular 
tissue. Hach bundle is enclosed in a sheath of dense cells, and 
some of the fibers show the barred structure already mentioned. 
Between the principal bundles are secondary nerves, each con- 
sisting of a single, perhaps san Sipe vessel. The epidermis 
is composed of dense irregular cells. The structures are similar 
on the whole to those in the pamela of the leaf of Dioon, 
though they also remind an observer of the leaves of Yucca 
riosa. 
4 On the supposition that the above described organs belong to 
one and the same plant, it had no doubt a thick though perhaps 
short stem, large compound leaves, having their divisions thick 
and rigid, with _parallel veins, fruits or large naked seeds, sup- 
and, perhaps, nothing of this kind — ae Heeeiagel SN to 
the fossil than the modern Dioon edule of Mexico, of which 
this may be regarded as a beading predecessor. It may, I 
ae i Baw civil by a in the gees Dioonites, created 
ar teri eous leaves e Mesozoic of 
ao yes wie if described by itself, ool go into the 
genus i 
