16 



ded. It is, indeed, often barely possible to distinguish 

 a fragment of the one from that of the other. 



Distribution , in coal formation : — at Radnitz and 

 Swinham, Bohemia; in Sydney coal-field, Cape Breton; 

 at Frostburg , Maryland ; ' in Pennsylvania. 



SIGILLARIEAE. 



STGILLARIA ARZINENSIS, COR DA. 

 PI. I, fig. 5. 



Corda, BeitriUje, p. 29, ^>/. 59, Jig. 12. 

 Unger , Gen. et Spec, j^- 247. 



Trunk longitudinally and strongly furrowed; flutings 

 straight and parallel ; surface slightly punctate ; cicatrices 

 elliptical, — situate remote and equidistant from the 

 edges of the flutings ; vascular bundles situate between 

 the centre and one focus of the ellipse, and denoted by 

 two crescent shaped markings placed diametrically oppo- 

 site, and, in the centre of the inclosed space, by a 

 dot -like marking. 



The specimen, of a segment of which we give a 

 representation, is, where deprived of its cortical integu- 

 ment, quite destitute of even the semblance of scars or 

 bundles of vessels. It differs from Corda's figure of an 

 impression from the coal mine of Arzin, Bohemia, only 

 in respect to the longitudinal distance between the scars, 



p. 13: — vol. 3, p. 47, i^/. 166 ; Go2)p. Syst. Jil. foss. p. 92, ^;Z. 

 23, Jig. 7: — Gat. foss. Pf, p. 13, pi. 8—15; Bromj. Archiv. 

 du Mus. d' hist. etc. torn. 1, 1839, pi. 29. 



1 Quart. Jour. Geol. Soc. II, p. 427 : — Fossil Ferns from 

 Frostburg. Maryland, — collected by Sir C. Lyell: by C. J. F. 

 Bunbury. 



