SIGILLARIA. 129 
which they are associated, by the fluted surface produced 
by the deep longitudinal grooves, and the regularly dis- 
posed imprints between the channels.* The carbonized bark, 
in large specimens, is often an inch thick, but in small 
examples is a mere pellicle, and being extremely brittle, 
flakes off with the slightest touch, leaving the inner sur- 
face exposed, with the coal remaining in the deep furrows 
and pits, as in Lign. 33, fig. 1. No traces of leaves, or fruit, 
in connexion with the stems, have been observed. The 
subjoined sketches (Zign. 33, and 34,) illustrate the usual 
aspect of these fossils. The difference between the im- 
ff \\ / 
\ \ 7 
neal \ 
/ Wk 
Lien. 34. SIGILLARIA SAULLII. 
Carb. Manchester. 
a. The imprints of the petioles on, the external surface of the 
carbonized cortical investment. 
b. The inner surface, exposed by the removal of the crust or bark. 
prints on the outside of the bark, and those on the exposed 
surface of the stem, from the removal of the cortical covering, 
is well marked in Lign. 34. 
* The stems of some recent dicotyledonous trees from New Zea- 
land, in the possession of Dr. Robert Brown, possess similar longitu- 
dinal ribs and furrows, both on the bark and alburnum, or naked 
wood, 
WOE) I. K 
