21,1^ M. YOKOYAMA; ME.SOZOIO PLANTS 



WIkiI Xathorsl calls Spliennpleri)^ cf. Gnrpperti Diuikor (IViträge, 

 p. 11, ])]. \l, Uli'. '2, o) ]>rol):ibly pertains to the same lern. 



Lor. — \ uasa (numerous fragments), Kaisekiyama (rare) and 

 Kaoaliara (rare). 



9. Peeopteris Browniana Dunk. 

 ?1. XXIV, Fig, 2, 3. PI. XXVII. 1-4, ocJ. 



Pecopteiis rf. BionnUiiui — Katliorst, Beitr. z. mosoz. Flora Japans, p. 13, pi. V, 

 fig. 5. 



Fccnpteiis Birnvniana — Dnnker, Monographie d. norcldentsclien Wealdenbildung, 

 p. -5, pi. YIII, fig. 7. Schenk, Fossile Flora der nord westdeutschen Wealdenforraa- 

 tion. p. 215, pl. XXVI, figs. 2, %t. Fontaine, The Potomac or Younger Mesozoic 

 Flora, p. 88, pl. XXIT, fig. 10, 11, XXIII, 2-7, XXYI, 3, 13. 



Ah'th()}iteiiH Broinndua — Schenk, Zur Flora der nordwestdeutschen ^Vealden 

 ormation, p. 159, pl. XXVI, fig. 3-5. 



Frond tn'pinnated ; racliises of the first and second order comparativeh/ 

 slender, hut r'lejid ; jtrimanj pinnœ sidiopposite ; secontlnrij jtiinuv eJonijoted, 

 stroiifUt or Jiiflithj ciirred, opposite, sidiopposite or alternate, more or less 

 directed f'orirard ; jtinnides leatlteri/, opposite or alternate, quite close or a 

 little separtite, fDojer-sliapcd, ohtiise or acute, sijuietiiia's Vaßitlij falcate at tlte 

 etui of tlie pinna\ ami attaclied to tlte racliis irilh tJie u-liole hase ; tlieii are 

 (jeneralhi entire in the middle part of the frond, hut in its posterior part, or 

 in its anterior part udiere secondanj pintuv are reduced to jiinnules, tlieij are 

 crenate or toothed, much more elongated cren to linear, atul non' and then, 

 stronghj fcdcatc ; reins in smaller entire pinnules indistinct, in larger and 

 crenate or toothed, ones, with a distinct midrein u-hich sends of acute, simple 

 or sometiuu's eren twice to thrice forled lateral reins. 



This is the most almndant fern at Kaisekiyama and F'ujikawa. 

 Nathorst had already compared it witli Vecopteris llrou-niatia Dunker. 

 The shaj'C of the pinnules in this fern is very diiterent in different 



