CASH & HICK : FLORA OP THE LOWER COAL MEASURES. 79 
Aster ophyllites. 
Specimens of this genus, the central vascular axis of 
which in transverse section display the well-marked triangular 
structure with truncated angles, have been found by Mr. 
Binns at Bank Top Pit, Southowram. 
Lepidodendron. 
Two species of Lepidodendra occur in the Halifax Hard 
Bed — the L. Selaginoides (= Sigillaria vasculare) and the 
L. Harcourtii. They are both found at Bank Top Pit, Sunny 
Bank Pit, Sugden Pit, and at Elland. 
Sigillaria. 
Though fragments of this plant are common, portions of 
the stem, with adherent bark, being found at all the four pits 
already enumerated, we are not able to record as yet the 
occurrence of a whole stem, large or small. 
Respecting the two genera, Lepidodendron and Sigillaria, 
Professor Williamson is of the opinion that " all the pheno- 
mena tend to confirm his previous conclusions that they belong 
to the same type of vegetation ; that they are equally Crypto- 
gamic plants, but that the Sigillariaa represent, so far as their 
vegetative organs are concerned, the highest modification to 
which the Lycopodiaceous type has ever attained." 
. (Farularia has been found, but we are not able to say from 
which pit.) 
Stigmaria. 
Under this name are probably confounded the roots and 
rootlets of more than one plant ; they are found at all the 
pits. In studying the microscopical sections of fossil organisms 
from the Halifax Hard Bed, it is specially requisite to be 
well acquainted with the structure of these rootlets, as they 
are found penetrating other organisms in every conceivable 
direction, and are calculated to seriously mislead a superficial 
observer. 
