16 M. YOKOYAMA. 



comes Czekanowskia, which, though imperfect, seems to be referable 

 to an already known form. The two species of Taxites, being present 

 only in isolated leaflets, do not admit of strict specific determina- 

 tion. Much less numerous are the Abietaceae, represented by 2 

 o-enera and 3 species. The most interesting as well as the most 

 important of these is Plnus Nordenskjoldi which Prof. Schmalhausen 

 brings under his new genus Ctjclopitys founded on similar leaves found 

 in Siberia which are arranged in whorls around the stem as in our 

 recent Sciadopitys. The species occurs in Japan only in isolated leaves, 

 for which I reason have adopted the older generic denomination of 

 Heer. It occurs also in Siberia, lîussia and Spitzbergen, and perhaps 

 also in Andö in Norway and Nancy in France. Pinus cfr. prodromus, 

 obtained so far only in fragments in Japan, has already been found 

 in Spitzbergen and Siberia. The last is the very interesting genus 

 Palissija. It is decidedly Rhaetic in Europe, and as a Jurassic plant 

 has hitherto been confined to India — to the three groups of Kajmahal, 

 Kach and Jabalpur. Its discovery in Japan, a country intermediate 

 in climatic conditions between Siberia Avhere the genus is unknown 

 and India where it is known, is of high interest, imperfect though 

 the specimen itself is. 



Conclusion. 



Out of the 3G well determined species of plants which Japan has 

 afforded, 20 species have been identified with those already known in 

 other countries. Of these IG or 80 % are ft> uuc l m tne ' ^ rown 

 Jura ' 20 ) of Siberia ; viz., 



1. Thyrsopteris Murrayana Brgt. 



2. ,, prisca Eichiv. 



•20) Dr. Oswald Heer : — Beiträge zur Juraflora Ostsibiriens und des Amurlandes, p. '10. 

 (Memoirs de l'Acad. impér. des Sciences de St. Petersbourg, VII e Série, Tome XXII, No. 12 et 

 dernier). Flora Fossilis Arctica, vol. IV. 



