10 AKT. P. — M. YOKOYA:srA. 



0. Czekanowskia Murrayana (Ltndl. et Hutt.). 

 7. Pahjssia iiiane.h urica n. sp, 



Todiies Williamsoni, Ginkgo lepida, Baiera gracilis, and 

 Gzekanowskia Murrayana are true Middle Jurassic forms. Schi- 

 zoneura hoerenùa is a species occurriii.; in both the Jur-issic and 

 the Rheetic of Europe, while Palyma manchurica has its nearest 

 allies in forms found in the Indian Jurassic and the European 

 Rh?etic. Therefore it is quite certain that the plant- and coal- 

 bearing series of Nien-tzu-kou belongs to the Middle Jurassic, 



b. Sha-ho-tzu, Oh'ang-tu.^^ 



From this locality, Mr. Ogawa brought several pieces of a 

 fine-grained yellowish sandstone, containing several fragments of 

 plants which belong to a single species of Dioonites Brongniarli 

 (Mant.). This Cycad which was first found in the Wealden of 

 Europe has also been found in the Jurassic cf Japan. Therefore 

 the coal-bearing layers of Sha-ho-tzu in which it was found \)Y0- 

 bably belong to the same formation. 



c. Ta-t'ai-shan, Ch'üan-yen-kou.-' 



From the coal-mine of this place, Mr. Ogawa brought a 

 thinly cleavable, l)rittle, grey shale containing several fragments 

 of plants which belong to two species, viz. 



1 . Podozamiles lanceoJala^ Ltxdl. et Hutt. 



2. Ginkgo sp. 



The first, as has already been stated several times, is a widely 

 distributed Jurassic species, although it occurs also in the layers 

 above as well as in those below this formation. . Of the second 

 species the specimens are all fragmentary and not determinable 



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