19 



to a hexagon , ) situate , longitudinally , one half their 

 length, or less, apart from each other, i and, transversely, 

 extending almost to the edges of the fluting; vascular 

 bundles small, — situate nearly in the middle of the 

 scar, and consisting, as usual, of the two opposite 

 crescent-shaped markings, which enclose the third dot-like 

 impression. Immediately adjoining the upper or smaller 

 end of the cicatrice is a distinct, superior, curvilinear 

 marking, extending entirely across the fluting. 



This species possesses many features in common 

 both with Sigillaria Bohlai, Brong. and Sigillaria Saulii, 

 Brong. The former of these is chiefly characterized in 

 distinction from it, in the perfect hexagonal developement 

 of its scars, and in the relative irregularity of its flutings ; 

 while the latter is invested with a peculiar bark-like 

 integument. It bears also some resemblance to Sigillaria 

 notata, Brong. which is, however, quite devoid of dis- 

 tinct furrows, and is still farther distinguishable in the 

 remarkable angularity of the lateral angles of its scars 2 . 



It should be remarked, that of Brongniart's four 

 figures of as many individual specimens of this species, 

 figures 1 and 2, plate 152, 1. c. — agree more partic- 

 ularly with our fossil impression. The position, which 

 is given to the bundles of vessels, is scarcely as near 

 the middle of the scar as our specimen indicates. 



Distribution , in coal formation : — at Fresnes and 

 Vieux Conde, France; at Stangalpe, Styria; in Pennsyl- 

 vania. 



1 Brongniart's representation — pi. 163, fig. 4, 1. c. — of a 

 fossil impression referable, as a variety, to the same species, 

 shows the longitudinal distance between two scars to be about 

 one and a half times the length of a scar. 



2 vid. Brong. Hist, veget. foss. I , p. 448. 



2* 



