12 ART. 5.— M. YOKOYAMA. 



both ends, being cuneate at base. The broadest part measures 

 21 mm ; the length may be estimated at about 55 mm. The 

 midrib is rather weak, becoming very weak towards the apex. 

 The lateral veins are very fine, rise at acute angles from the 

 midrib and are divergent, although anastomozing with one an- 

 other to form elongated nets. 



That this fragment belongs to the above named genus can 

 hardly be doubted. It is very likely that it represents a form 

 which, if not quite identical with, is at least closely akin to, 

 Sagenopteris Fhillipsl Presl (Möller, Bidray till Bornholms 

 Fossila Flora, Pieridofyter, pi. V, fiy. 1-7) and S. rhoifolia Presl 

 (Schenk, Die Fossile Flora der Grenzschichten des Keupers and 

 Lias FranhenSf pi. XII), both from the Rhsetic of Europe. 



3. ARTHROPHYOPSIS ? sp. 

 PI. III. Fig. 6. 



A small fragment of a fern-frond (?), having distinct, equal, 

 and more or less parallel veins which here and there unite to 

 form long nets. According to this mode of venation, it bears a 

 close resemblance to what Nathorst has given the name of Ar- 

 throphyopsis Nilssoni {Floran vid Bjuf, pi. VII, fig. 5, VIII, 6. 

 Floran vid Höganäs und Helsinghorg, pi. I. fig. 6) from the 

 Rhsetic of Sweden. 



4. NILSSONIA SP. 

 PI. III. Fig. 1, 8. 



There are two specimens of a Nilssonia, which, though 

 somewhat different in appearace, probably belong to the same 



