1 
334 WHITE—OMPHALOPHLOIOS, A NEW LEPIDODENDROID TYPE. 
right in the figure. There is, however, when the entire cortex is pre- 
served, no line of displacement nor break in the continuity of the epi- 
dermis beyond the leaf scar along this large subcircular or subtriangu- 
lar boss that, in my judgment, can be construed as marking the separa- 
tion of any appendage or organ. 
Proceeding to the observation of the characters above and within the 
angle of the leaf scar, we note, as seen in the photographic enlargement, 
plate 23, an oval or slightly ovate area, the vertical diameter of which is 
about 2.5 millimeters, the transverse diameter being about 1.75 milli- 
meters. The surface of this oval area is slightly raised as a boss above 
the concave surface within the large convex, rounded boss,* and is bor- 
dered in many cases by a very narrow, low, and sometimes obscure rim 
or by a narrow adjacent furrow. One or both of these conditions are 
possibly merely the result of pressure on the surface of the smaller oval 
boss, since there is occasionally seen hardly more than the sharply de- 
fined change of level in passing across its margin down to the large boss. - 
I am inclined, however, to regard the narrow bordering rim, which is 
generally present, as normal. The lower end of this oval rim appears to 
become nearly contiguous to, if not actually united with the leaf scar ; 
and at the lowest point it seems, in a few bolsters, to die out below and 
partly inclosing a small punctiform mammilla, which in one instance it 
appears to completely inclose. It is possible that this mammilla, which 
is in many eases discernible, should be regarded as belonging to the 
vascular trace of the leaf; but in the specimens before me it seems to be 
distinct from the ieaf, if not in fact separated therefrom by a continua- 
tion of the oval rim. Within the oval boss just described is a small 
concave oval area, which is sometimes obscure in the lower part. This 
depression, the margin of which is nearly parallel to the outer border of 
the oval boss, the distance between being but little more than .5 milli- 
meter, is deepest near the upper end, where it surrounds a minute bor- 
dered pit or umbilicate trace. The latter is the “ trace” observed in the 
central area of the impressions and decorticated stems first described. 
The true vascular trace of the leaf is frequently defined in the carbon at 
the margin of the ovate-triangular concave areas representing the com- 
pressed large bosses in those specimens. 
It remains also to note a minute mammilla, sometimes slightly de- 
pressed, occasionally seen a little above the upper margin of the large boss. 
This trace lies within a loop of the low round vertical ridges sometimes 
crossing the large boss. Though these ridges are sometimes clear in the 
molds or impressions, appearing as grooves or furrows, they are usually 
* The interior oval-triangular area of the types first described. 
