nearly a crescent shape, having no inferior angle, — 

 but, instead , one continuous , strongly curvilinear 

 boundary. 



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

 hemia; in Ohio. 



LEPIDODENDRON ELEGANS, BRONG. 

 PI. Ill, fig. 3. 



Brong, Hist, vcfjet. foss. II, pi. 14. 

 Ungef , Gen. et Spec. p. 255. 



LEPIDODENDRON GRACILE , 



Brong. Hist, veget. foss. II, ^j/. 15. 



Areolae very strongly marked , approximatively hex- 

 agonal, — the perimeter being, however, more or less 

 curvilinear; superior and inferior angles acute; cicatrice 

 rhomboidal , and situate about a third of the vertical 

 length of the areola remote from the superior angle ; 

 central ridge prominent, and extending in a straight line 

 from the superior to the inferior angle ; markings, proceed- 

 ing from the lateral angles of the rhomboidal cicatrice, 

 prominent, curvilinear and extending to the inferior 

 boundary of the areola. 



Brongniart's figures of this species perfectly agree 

 with our specimen, and most obviously differ from Stern- 

 berg's Lepidodetidron ohovaium, i with Avhich it is often 

 supposed to be identical, and linger places it as synon- 

 ymous, — giving it, to be sure, the benefit of a note 

 of interrogation. 



This undeniable disparity is apparently not sufliciently 



1 Slernb. Vers. I, p. 10, pi. 6, fig. 1, pi. 8, fig. 1 ; Unger, Gen. 

 et Spec. p. 255. etc. 



