18 M. YOKOYAMA. 



3. Asplenium whitbiense Brrjb. 



4. ,, argutulum Hr. 



5. ,, distans Hr. 



6. Peeopteris exilis Phill. 



7. Nilssonia, orientalis Hr. 



8. Podozamites lanceolatus hindi. 

 [). Ginkgo digitata Brgt. 



With the Chinese and Mongolian Oolitic flora worked out by 

 Newberry, 23 ) Schenk 24 ) and Schmalhausen, 25 ) we have four iden- 

 tifications, Asplenium'- whitbiense , A. argutulum, Macrotaeniopteris cfr. 

 Bichthofeni and Podozamites lanceolatus ; while with the peculiar In- 

 dian flora of Kach and Jabalpur 26 ) we have only two, Asplenium 

 whitbiense and Podozamites lanceolatus. 



The Jurassic flora of Russia — from the regions of Orenburg and 

 Isjum in its southern part, and from Petschora-Land on the western 

 flank of the northern part of the Ural Mountains — has several species 

 in common with ours. Among the plants mentioned by Eichwald 27 ) 

 and Schmalhausen 28 ) we find many Japanese forms such as Asplenium 

 whitbiense, A. argutulum, Thyrsopteris prisca, Podozamites lanceolatus 

 and Ginkgo digitata, which last is an important Oolitic species. Our 

 flora is also allied to that of Andö 29 ) and Turkestan, 30 ) whence how- 



23) J. S. Newberry : — Description of Fossil Fluids from the Chinese Coal-bearing Rocks in K. 

 Pumpelly's Geological Researches in China, Mongolia, and Japan. (Smithsonian Contributions 

 to Knowledge, Jan., 1866.) 



24) A. Schenk: — Jurassische Pflanzen, in Richtlufen's China, vol. IV, part. X. 



25) J. Schmalhausen : — Pflanzen aus der nordioestliclien Mongolei. (Melange biologique tirés 

 du Bulletin de lAcad. Imper. d. Sc. d. St. Pefcersbourg, tome XI, March, 1883.) 



26) O. Feistmantel considers both Kach and Jabalpur as of Lower Oolitic series. Cf. Juras- 

 sic Flora of Kach, p. 71. and Jurassic flora of the Jabalpur Group, p. 20. 



27) E. d'Eichwald : — Lethaea Russia, II. 



28) J. Schmalhausen : — Beiträge zur Juraflora Russlands. (Bulletin de lAcad. Impér. d. 

 Sciences de St. Petersbourg, Tum. XI, Jan. 1879.) 



29) 0. Heer :— Ueber die Pflanzen-Versteinerungen von Andö in Norwegen. Flora Fossilis Arc- 

 tica, vol. IV. 



30) G. Romanowski: — Materialien zur Geologie von Turkestan. 



