38 ART. S. — H. YABE. 



undulating. Median vein thick, evanescent near the apex ; lateral 

 ones obsolete, remote, subopposite, oblique and single-forked. 



One of the pinnae measure 3 cm. in length and bears nine pin- 

 nules on one side of the rachis. 



This species is evidently distinct from the foregoing two. 



SPHENOPTERIS, Beongn. 



SPHENOPTERIS NAKTONGENSIS sp. nov. 



PI. IV., figs. 10, II. 



Frond tripinnate, deltoid ; principal rachis slender, flexuous ; 

 primary pinnae subopposite, rather remote, attached to the rachis 

 at a wide angle, linearly oblong, pinnatifid ; ultimate pinnae 

 alternate, very short, passing anteriorly into lobed pinnules ; 

 pinnules oblong or cuneiform, alternate, oblique, decurrent on the 

 slightly winged rachis, more or less deeply lobed ; lobes denticu- 

 lated ; venation indistinct, veins very close, flabelately dichtomous. 



Among the hitherto described ferns, there is none which is 

 identical with this Korean fossil. Ruffordia Geopper0 is the 

 only one which more or less closely approaches it. 



SPHENOPTERIS sp. 



PI. L, fig. 15. 



Frond bipinnate, rachis slender ; pinnae linear, springing 

 almost at right angles from the rachis, pinnately lobed ; lobes 



1) Seward Wealden Flora, I., p. 75. 



