MESOZOIC PLANTS FROM KOREA. 51 



As it appears from previous writings on the geology of the 

 said region, the plant bed of Kinebashi, Uchinami and Ötani 

 with Adiantites Sewardi, and that of Hakogase with Nilssonia 

 orienialis lie immediately upon the Ammonites-bed of propably 

 the lower Malm age, and Prof. Yokoyama, in his paper, suspects 

 that the plant bed of Ozö, prov. Kaga, with Dictyozamites fal- 

 catus, may possibly be somewhat older than the Bathonian ; 

 taking it as a whole, the Tetori series seems to represent a 

 phase of the Jurassic in the narrowest sense of the word (i.e. 

 Malm and Dogger). 



The resemblance of the Japanese flora to the Siberian was 

 pointed out by Geyler ;^^ Heer^> also mentioned that Thyrsopteris 

 elongata of Geyler is a type of fern very common in the Siberian 

 Jurassic. Prof Yokoyama 's renewed examination of the rich 

 material of the Tetori flora revealed that 16 out of 36 species 

 are found in Siberia.^^ 



Beside Nilssonia orientalis, there are other forms common to 

 Siberia and Korea, such as Coniopteris kymenophylloides, Clado- 

 phlebis denticulata, Finus Nordenskjoldi, P. prodromus and Podo- 

 zamites lanceolatus. These, however, are cosmopolitan forms, also 

 found in Japan and China. 



From China and Mongolia, Nathorst,''^ Schenk,^^ Zeiller,"^^ 



1) Geyler: Ueber Fossile Pflanzen aus der Juraformation Japans. — Ueber Einige 

 Palseoutologische Fragen, insbesondere über die Jurafortnation Nordostasiens. 



2) Heer : Nachträge z. Jura-flora Sibiriens, p. 4. 



3) Yokoyama : 1. c. p. 16. 



4) Nathorst: Om forekomsten af Dictyophyllum Nilssoni Brongn. sp. i. Kinas Kol- 

 orando bildningen. (By review.) 



5) Schenk : Pflanzlich Versteinerungen (Richthofen's China IV.). — Die während der 

 Reise des Grafen Bela Szechenyi in China gesammelten fossilen Pflanzen. 



6) Zeiller : Remarques sur la Flora Fossile de 1' Altai, à propose des dernières de- 

 couvertes Palseobotanique de M.M. les Drs. Bodenbender et Kurtz dans le république Ar- 

 gentine. 



