POSSIL FLORA. 57 



PLATE XX. 



" SiGILLARIA." 



{Euphorbites vulgaris, of Artis.) 



Thjs species is characterized by the remarkable fish-like form of the cicatrices left by the 

 base of the leaf-stalks, and by the rapid tapering of the upper part of the stem, as shown in 

 the reduced figure 1, which represents a specimen nine feet long, five feet in circumference 

 at the base, and only twenty-one inches in circumference at the upper end. 



The ridges, which at the superior extremity are simple and narrow, and parted only by a 

 single line, become at the lower part of the stem wide and flat, and are separated by a groove 

 of equal breadth, as seen in fig. 3, which is taken from b, fig. 1. 



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. 



