Fig. 2, represents a portion towards the upper end, at A, fig. 1; and exhibits the different appearance of the bark, and the under surface, when the cortical investment is removed; the imprints in each case differing very much in appearance.

The specimen from which the drawing was taken, was from a sandstone quarry near Altofts, in Yorkshire. In one of the abandoned chambers of the upper Elsecar coal-mine, seven trunks of this tree were suspended freely from the roof, the largest of which was eight feet in circumference.

Plate XXI.

PLATE XXI.

"Ficoid Stigmaria."

(Stigmaria ficoides, of M. Brongniart, Hist. Veg. Foss. tab. 17, figs. 5, 6.
Ficoidites furcatus, of Mr. Artis.)