Jurassic Plants from Kaga, Hida, and 

 Echizen. 



By 

 Matajiro Yokoyama. 



1. General Remarks. 



Until recently very little was known of the fossil flora of Japan. 

 The first systematic treatment of it is found in the work 1 ) of 

 Dr. H. Th. Geyler who, in 1877, described and figured 12 species 

 of Jurassic plants collected by Dr. J. Rein in the valley of the 

 Tetorigawa in Kaga. Three years later the same author in the 

 " Botanischen Mittheilungen " 2 ) referred to the occurrence of Carpi- 

 nus grandis linger in the Tertiary formation of Mikawa 3 ) in Honshu. 4 ) 

 This was the only literature relating to the fossil flora of our country 

 down to the year 1881, when for the first time, Prof. A. G. Nathorst 



1) Dr. H. Th. Geyler:— Ueber Fossile Pflanzen aus der Juraformation Japan?, with 11 pages 

 and 5 plates. (Palaeontographica, 1876—1877. vol. XXIV, 5th livr.) 



Prof. Dr. D. Brauns méritions in his "Vorläufige Notizen über Vorkommnisse der Juraformation 

 in Japan" (Mittheiluugen der deutschen Gesellschaft für Natur-und Völkerkunde Ostasiens, June, 

 1880, p. 440—442) the following species of plants based on his examination of Dr. Koto's collec- 

 tion : Podozamites, Asplcnium argutulum Hr., Tln/rsopteris elongata Geyh, Adiantites, Taéhï&p- 

 teris solitaria Phill. sp ( = Scolopendriites solitarius Phill.) and Ginkgo sibirica Hr.. An exam- 

 ination of the specimens to which these names relate led me to the conviction that Prof. 

 Brauns' Taenioptcris solitaria is in reality Nilssonia ozoana in., aud as to Ginkgo sibirica which is 

 mentioned by him, I was not able to find out any specimen undoubtedly referable to that species. 



2) Dr. H. Th. Geyler -.—Carpinus grandis Ung. in der Tertiärformation Japans (Botanischen 

 Mittheiluugen in Abhandlungen der Seukerbergischen Naturforscheuden Gesellschaft, 1880.) 



3) Mikawa is the name of a province. The exact locality is probably Komura in Nishi-kamo- 

 göri, as no other place is as yet known to yield Tertiary plants in that province. 



4) The name Honshu applies to the main island of Japan aud is certaiuly preferable to any 

 other of the names that are sometimes used. 



