94 EXPLANATION OF PLATE 56. 



retains the bark-scales modified by pressure of the 

 Strobilus or cone that grew from the centre of the 

 disk. The upper portion of the Scar is without in- 

 dications of bark-scales, and is covered with radi- 

 ating furrows, impressed on it by the long slender 

 scales of the base of the Strobilus, which have obli- 

 terated the bark-scales.* 



The character of this scar approaches to that of 

 Fig. 5, but its proportions differ, measuring 3j 

 inches in the longer, and 2J inches in the shorter 

 diameter. The scaly bark (which in Fig. 5 has 

 been almost entirely removed from the area of the 

 scar), is preserved on the lower portion of the disk 

 of Fig. 6. Scale two-ninths. (Original.) 

 Fig. 6\ Cast of Ulodendron Conybearii (nobis) formed 

 by Pennant sandstone of the Coal formation at 

 Stapleton near Bristol. This cast expresses the 

 exact form of an oval scar, or cavity on a stem 

 from which a cone had fallen off. 



The disk is covered with slight ridges and furrows, 

 radiating in all directions from the point of inser- 

 tion of the cone, and formed by pressure of its 

 lowest scales upon the portion of the stem to which 

 it was attached. Beneath the point of insertion, a 



* The portions above and below the line drawn across Fig. 6, are 

 copied from two scars in Rhode's figure. Rhode considers these 

 impressions to be flowers, and the compressed bark-scales to be the 

 Petioles of the flower, and lias represented the trunk in an inverted 

 position. 



As, in every species of Ulodendron which we have seen, the fur- 

 rows produced by scales at the base of the cone, are deepest on the 

 upper portion of the Scar, we infer from this circumstance that the 

 cones were inclined upwards and inwards, with their axis approxi- 

 mating to that of the stem from which they issued. 



