210 M. YOKOYA^MA ; MESOZOIC PLANTS 



1. ()n.iicliio2J>iis elouijata Gcijl. sp. 



2. rccoptcris Broiruiana I)inil\ 



o. Pecoplfris cf. virijinicnsis Fout. 



4. Podoznniites lanccolatus LiiuJL rar. mi)ior Heer. 



5. Voilozamites lanceolatvs Lindh rar. JatiJ'nlia Heer. 

 G. l\jdo.:auutes pusillus Veloiov. 



7. Zamiopliijlhnn Bnclvianum Hit. .sp. 



(S. ZamiopliijJluu} Bnchiaiunn Ett. sp. rar. auqiisfifoJia Fout. 



1). Xilssoiiia i^chaiiiiihurgensis Diiul:. sp. 

 10. XilssoNÏa Joluislriipl Heer. 



\jQX us now s])efik of ench specie.s separately. Foilozamites 

 laucf'olattts has u very wide ,2'eo2:rapliical l'îuiîïe. hut its vertical 

 distribution is equally as wide, for it appears in the liluetic and goes 

 up as high as the Cenomanian, according to Aelenovskv. It is not 

 improhaljle that we have here to deal, in many cases, with forms which 

 are in re-dity specifically ditterent, but as long as we are left to rely 

 only on leaves in their determination, we can not l)ut consider these 

 forms as belonging to one and the same species. Therefore this cycad 

 only tells us that we have here a formation which is referable to the 

 Mesozoic group. ( hn/clu'npsis eloiujata has hitherto been found only in 

 the Dogger of Japan where, however, it f)rms one of the most adjund- 

 ant ])lants. On this account we do riot know yet how wide its 

 vertical range may be. The case is différent with the three species 

 of Fecopteris Broirniana, Xihsoiiia scliaunihunjensis, and Zamiojjln/llnm 

 Biichianum. The first two are characteristic AVealden plants in Europe, 

 and the first has been also described from the l^otomac Formation in 

 America which Fontaine considers as Xeocomian. The third one is 

 Urgonian in Europe and Potomac in America, and is ^■ery abundant in 

 the latter region. These three species are therefore very im|)ortant for 

 Japan, especially because they occur in many localities and sometimes 



