2 ART. 5. — M. YOKOYAMA. 



contains anthracite layers in its lower portion, and is underlaid 

 by a marine limestone filled with Fiisulina. 



The species of clearly determinable plants which I can now 

 mention from Yamanoi are the following : 



1. Cladophlebis nebbensis (Brgnt.) 



2. Cladophlebis yamanoiensis Yok. 



3. Dictyophyllum Nathorsti Zeil. 



4. Dictyophyllum japonicum Yok. 



5. Dictyophyllum Kochibei Yok. 



6. Podozamites lanceolatus (Lindl. et Hutt.) 



7. Nilssonia Inouyei Yok. 



8. Baiera paucijMriita Nath. 



Among these, Cladophlebis nebbensis and CI. yamanoiensis are 

 what I formerly called As])lenium Rœsserti Presl, and Asp. 

 Rœsserti var. whitbiensis Brgnt. respectively, while Dictyophyllum 

 Nathorsti is a species which I formerly compared to D. acutilobum 

 Braun. 



It may be here added, that among the plants brought back 

 by Mr. Inouye, there are fragments which seem to be referable 

 to the genera Pinus and Phœnicopsis, but which are at present 

 still undetermined. 



A glance at the above list shows the indubitable Rhsetic 

 nature of the florula. The three species, Clado2jhlebis 7iebbensis, 

 Dictyophyllum Nathorsti and Baiera paucipartita, are forms hither- 

 to known only from the Rhsetic. Podozamites lanceolatus is in- 

 deed a form of wide occurrence in the Jurassic, but its first 

 appearance seems to be in the Rhœtic. The remaining species 

 being those found only in Japan are not available for the deter- 

 mination of the age. But we must remember that a form like 

 Dictyophyllum japonicum exhibits a great resemblence to one 



