34 ART. S. PI. YABE. 



Japanese Jurassic flora and believed P. exilJform'is to be in reality 

 no other than this species ; bat subsequently, he expressed the 

 opinion that the Tetori form might possibly belong either to P. 

 Browniana or P. Geyleriana ; Nathorst also pointed out the 

 great resemblance existing between P. exiliformis and his P. 

 Geyleriana 'P and Seward-^ is of the opinion that P. exilis from 

 Japan is probably identical with, or at least very close, to 

 P. Browniana ; and P. exiliformis also does not suggest a plant 

 Avith a well marked specific difference. 



According to Bunbury"^^ and Raciborsky^^ who described the 

 fertile pinnules of P. exilis, the sporangia possess an apical 

 annulus, and are in a single row on each side of the median vein ; 

 hence the latter author was led to propose the new generic name 

 Kluhia for the above fossil, which shows a decided affinity to 

 Schizaeaceae. 



The round dots in the Korean examples are in all probability 

 of a different nature from those of Kluhia exilis, though there is 

 a great resemblance between them. The present writer does not 

 regard this resemblance as an evidence of relationship. 



At any rate, fig. 9, pi. I. in Prof. Yokoyama's work ex- 

 hibits a greater likeness to the Korean form than figs. 8 and 10 

 in the same plate. The example figured by Geyler also resem- 

 bles it. 



The writer has examined some specimens of the P. exilis 

 type from Hakogase, collected by Mr. S. Matsushima and now 

 deposited in the Science College Museum. One of them is pre- 



1) Nathorst : Mesoz. Flora Jap;ins, p. 48. 



2) Seward : Fossil Flora of Cape Colony. 



?>) Eunbury: Quart. Jour. Geol. Soc. 1851. VII. P. 188, pi. XIIL, fig. 5. 



4) Raciborsky: Ueber die Osmundaceen u. Schizaeaceen d. Juraformation. 



