JOURNAL OF THE OOLLE&E OF SOIEHOE, IMPERIAL UNIVERSITY, 

 OKYO, JAPAN. 



VOL. XX., ARTICLE 5. 



Mesozoic Plants from Nagato and Bitchu. 



By 



Matajiro Yokoyama, Rigakuhakushi. 

 Professor of Palaeontology, Imperial University of Tokyo. 



With 3 plates. 



1. Plants from Nagato. 



Some fourteen years ago, I wrote a brief paper^^ on fossil 

 plants discovered by Dr. T. Kochibe at Yamanoi, in the Province 

 of Nagato, in which I advanced the opinion that they were most 

 probably Khsetic in age. This view is now entirely confirmed 

 by my recent study of a later collection made by Mr. K. Inouye 

 at the same place. This collection, although not rich in the 

 number of species, contains specimens which are valuable both 

 as supplementing those previously found only in an imperfect 

 state, and as making possible a determination of the exact age 

 of the layer in which they were obtained. 



The plant-bearing formation of Yamanoi is below the so- 

 called Inkstone Series with which it was formerly incorporated. 

 The lower part of the latter has been recently proved by me to 

 be Liassic^^ from the Ammonites entombed in it. The former 



1) On Some Fossil Plants from the Coal-bearing Series of Nagato. Journal of tlie Col- 

 lege of »Science, Imperial University, Japan, Vol. IV, part, II, 1891. 



2) Jurassic Ammonites from Echizen and Nagato. Ibid., vol. XIX, art. 20, 1904. 



