EXPLANATION OF PLATE 56. 93 



Fig. 4. A single scar formed by the attachment of a cone 

 of another species, Ulodendron Lucasii, (nobis,) 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, 

 4£ 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 are 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 Rhodii. (nobis.) Scar on a scaly 

 stem, from the Coal field of Silesia, figured by Rhode 

 in his Beitrage zur Pjlanzenkunde der Voncelt, L. 

 2. PI. 3. Fig. 1. The lower portion of this Scar 



