21 



causing their crenationj vascular bundles denoted by 

 three transversely opposite markings , — the two cres- 

 cent shaped extremes enclosing the third horizontal linear 

 impression, — situate near the superior or smaller edge 

 of the cicatrice. 



The following are additional important features of 

 this species in general. 



Trunk dichotomous ; cicatrices twice as large upon 

 the trunk as upon the ramifications , and , upon the 

 latter, more curvilinear in their superior or smaller edges 

 than upon the former. 



Distribution , in coal formation : — at Radnitz , Bo- 

 hemia; at Werden near Diisseldorf; at Eschweiler near 

 Aix-la-Chapelle ; at Bochun and Hattingen, Westphalia ; 

 at Stangalpe , Stj'ria ; at Horton and Windsor , Nova 

 Scotia ; at Sydney , Cape Breton ; in Pennsylvania. 



SIGILLARIA ICHTHYOLEPIS, CORD A. 

 PI. II, fig. 2. 



Corda , Beitriige, p. 29, pi. 9, Jig, 19, 

 Unger , (Jen, et Spec. p. 231. 



FAVL'LARIA ICHTUYOLEPIS , 



Sternb. Vers. II, pi. 38, Jig. 2 b, (2 a ?) 



Denuded of its cortical exterior, our specimen is 

 characterized as follows : — trunk completely covered 

 with delicately marked, contiguous and commensurate 

 cicatrices, which have a longitudinal and regular colum- 

 nar arrangement; cicatrices hexagonal and about twice 

 as wide as long, — their opposite sides and angles are 

 equal, their two lateral angles acute and their remaining 

 four obtuse, while the four sides, forming the two lateral 



