MESOZOIC PLANTS FROM KOREA. 39 



obtuse, acuminate with entire margin ; somewhat falcate ; venation 

 of a Sphenopteris type, that is to say, with a distinct median vein 

 sending off an obsolete secondary vein into each lobe. Sori in 

 two rows, one on each side of the median vein, placed near the 

 base of each lobe and on the summit of the uppermost branch 

 of the vein. 



At a first glance, this form comes near to DicJcsonia Bin- 

 drahmensis Feistmantel^^ from the Jurassic of the Rajmahal 

 Hills, India, and Alsophila polonica Raciborsky^^ from the neigh- 

 bourhood of Cracow. But, no detail of the fructification being 

 observable in tlie only specimen at hand, its generic position is 

 not certain. 



ADIANTITES, Goep. 

 ADIANTITES SEWARDI sp. nov. 



PI. I., figs. 1-8. 



1888. Rhacopteris ? sp. Matsushima : A Geol. Rep. of the 



East. Part of Echizen including the Upper Tetori- 



gawa region, in Kaga. (MS.) P. 188, pi. VII., 



fig. 5. 



Frond bipinnate, rachis thin and straight ; pinnules alternate 



to subopposite, close but rarely imbricated ; rounded at the upper 



margin and attenuated below to a narrow base, with a short de- 



1) Feistmantel: Jurassic Flora of the Rajmahal group in the Rajmahal Hills. P. 23, 

 pi. XXXVII., figs. 2, 2a. 



2) Raciborsky: Flora Kopalna ognitrawalych glinek Krakowskich. Archaegoniatae, 



P. 29, pi. IX., figs. ?., 4. 



