EXPLANATION OF PLATE 56. 
93 
Fig. 4. A single scar formed by the attachment of a cone 
of another species, Ulodendron Lucasii, ( 7 iobis) dis- 
covered by Mr. Lucas in the S. Wales Coal field 
near Swansea. Some scales and speared-shaped 
leaves of the trunk are still preserved around the mar- 
gin of this scar. As the bark has fallen off, we have 
only the impression of its inner surface. This sur- 
face exhibits small apertures, through which vessels 
entered from beneath the bark-scales into the trunk. 
On the upper part of the disk, the traces of many 
of these vessels have been obliterated by pressure 
of the cone. Scale one-fourth. (Original.) 
Fig. 5. Ulodendron Stokesii. (nobis) A large oval scar, 
m inches in its longer, and 3^ inches in its shorter 
diameter) preserved in shale from an unknown lo- 
cality in the English Coal Formation. On the 
margin of this scar are the remains of rhomboidal 
scales, and impressions of scales, and a few small 
leaves. Within the disk a few fragments only of 
the bark remain near its upper margin. Near its 
centre, is the mark of the insertion of the stem, of 
a large cone. The lower half exhibits a series of 
small tubular cavities, marking the place of vessels 
which passed from the bark into the trunk, one 
beneath each of the bark-scales that have fallen off. 
In the upper half of the Scar, there arc but slight 
traces of these cavities, and the surface is marked 
with furrows, produced by pressure of the long 
radiating scales of the base of the cone. Scale one- 
fifth. (Original.) 
Fig. 6. Ulodendron Ehodii. (nobis) Scar on a scaly 
stem, from the Coal field of Silesia, figured byEhode 
in his Bcitfage ztir Pjianzenkunde der Vorwelt, L. 
2. PI. 3. Fig. 1. The lower portion of this Scar 
