6 AKT. 9.— H. YABE I 



Weiss and Geyler expressed the opinion that the Chinese 

 form is identical with Idiophyllwn rolundifolium Lesqueraux 

 from the Carboniferous of Illinois, but the latter is now proved 

 by Sellard^^ to be Neuroptei^is rarinei'vis in a particular state 

 of preservation, and consequently the geiuis Idiophylliim seems 

 rightly to be removed from the present consideration. 



The above mentioned study was made three years ago, and a 

 very brief account of it, especially my suggestion of a new specific 

 name ((r. dentata) for the frond in order to distinguish it from the 

 type species of the genus, G. nîcotiœ ni folia, was given in our Jour. 

 Geol. Soc. Tokyo, Vol. XL, No. 127, p. 159, 1904 (in Japanese). 

 Hoon afterward, a fragment of a similar frond was found among 

 the Chinese fossils collected by Prof. Yamada of Kyoto Univer- 

 sity. This is illustrated in Prof. Yokoyama's recent paper^ as a 

 species of Clathropteris ; there is some doubt on account of its quite 

 incomplete preservation. The locality is Shui-tang-pu, Hsuan- 

 w^ei-chou,"^ Prov. Yunnan, and the other fossils found in associ- 

 ation are Angiojjteridium infarcium Feistm. and Fhœnicopsis f 

 Yamadai Yok. according to the author, who regarded the flora 

 as of the Triassic age. It is this important fact, together with the 

 doubt expressed by Prof. Zeiller^^ as to whether the Lui-pa-kou 

 bed is not of the Triassic age, instead of being Carboniferous, 

 (this being his conclusion from a detailed investigation of the 

 Rtetic flora of Tonkin), which led nie to consider oui' Mun-gyong 

 series to be of the same age, as alread}- stated at the beginning 

 of this paper. 



]J SellaRD : On the Validity oi Idiophyllum n^iuulifvUviii. 

 "2) YoKOYAMA : Mcsozoic Plants from China p. 14. 



4) Zeillkk: Flore Fossile des Giles de Charbon du Tonkin, p. loti. 



