21Q M. YOKOYAMA; MESOZOIC PLANTS 



Veins rather nnmerovs n'itli distinct hut evanescent midrein : lateral veins 

 aciite^ simple or once forhed. 



The g'eneral features (^f this graceful fern are those oï Onijcliiopsis^ 

 although in some respects it also resemhles Diclsonia. 'JTie generic 

 determination is therefore not settled. 



Loc. — Kaisekiyama. Only one specimen. 



6. Adiantites yuasensis, m. 



VI XXI, Fig. 15. 



I have onl}' a single and not quite perfect specimen of this fern. 

 It shows a pinna with a slender rachis on which we see sul)o})posite, 

 distant, very thin, oval pinnules cuneate at base and furnislu^d with a 

 short st;dk. The npper margin is not well preserved. Veins are 

 very typical, being fine, verv numerous, equal, divergent, and repeat- 

 edly di'-hotomous. Therefore, there is not the least doubt tliat we 

 have here to deal with a fern closely akin to our recent Adiantum. 



Schenk desci'ibed from the Albours Chain a similar form under 

 t]\Q ii-A]\\L' oï Adianlinn Tietzei (Die von E. Tietze in der Albourskette 

 gesain. foss. l^flanzen, p. 8. ]»I. TI, fig. 2) whicli possesses larger and 

 moi-e closely set ])iiinules. 



JjOC. — Yuas;i in Kii. 



7. Pteris (?) sp. 



V\. XX, Fig. 9. PI. XXI, Fig. 6, 7. (?). 



A fragment of a fern from Kagahara (PI. XX, fig. D) having 

 thin, parallel-sided, spathulate })innules, which measure a little o\qy 2 

 cm. in length and <S-9 mm. in breadth. One of the pinnules is seen 

 attached to the slender rachis by the greater part of the base. 

 \"eins are fine and numerons. The midvein is distinct. The lateral 



