38 M. YOKOYAMA. 



place after they have gone on for a considerable distance towards 

 the margin. 



Our plant shows a great resemblance to Macrotaeniopteris Bich- 

 thofeni Schenk (Richthof en' s China vol. TV, pi. LI, fig. 4, 6) in 

 having acuminate fronds and numerous dense veinlets, with which 

 I indeed compare it, notwithstanding the somewhat smaller size of 

 frond. Loc. — Simamura. 



Order 2. Rhizocarpeae. 



Fam. 1. Salviniaceae. 



1. Sagenopteris Presk 



20. Sagenopteris sp. 

 PI. X, tig. 3, 3a. 



On a piece of black sandy shale from Ozö there lie a few 

 scattered fragments of longly-obovate leaflets with an evanescent 

 median vein and numerous fine veinlets, radiating towards their 

 margin and forming, as they go, much elongated nets or aréoles. The 

 leaflets are more or less oblique in shape, and acute at apex. 

 These characters at once show that we are dealing with a species 

 of Sagenopteris that is at least very closely allied to S. rhoifolia Presl., 

 under which name indeed I mentioned it in Bull. Geol. Soc. Japan, 

 Part B, A T ol. I, No. 1, p. 6. But now lam of opinion that it is better 

 to consider these fragments under the simple name of Sagenop- 

 teris sp. Loc. — Ozö. 



Order 3- Calamarieae. 



Fam. 1. Equisetaceae. 



1. Equisetum L. 



