208 ^^- YOKOYAMA; MESOZOIC PL.VXTS 



of these fossils, it is very necessary to examine wlietlier tlie floras of 

 all the localities represent one and the same i^'-eologieal horizon. In 

 the first place, that the 8 localities around Ryöseki, namely, Kataji, 

 Ishiseki, Toaodani, Yakyö, Ueno, Toriknhi. Otani, and Haginohmi, 

 palœontologically belong to the same formation is not to he the least 

 dcmhted ; for ont of 15 species which were obtained from all the places 

 together, 12 are fonnd at Kataji, so that Ishiseki with 6, Tögodani 

 with <S, Ueno with 4, Yakyö, Toriknhi, Otani, and Ilaginotani, each 

 with 2, may be fairly considered as a part of the Kataji flora. Of 

 the o species which are not found at Kataji, 1 is from Ueno, 1 from 

 Tögodani, and 1 from Yakyo, the last of which, however, is represented 

 in several other spots out of the Ryöseki District. 



Also that the four places in the valley of the Katsuragawa, aIz., 

 Sakamoto, Fujikawa, Tarmo, and Mitani, belong to the same terrain, 

 although the nundjci* of species is not so large, and the ivlation of the 

 respective floras to one another is not so evident as in Ivyôseki, there 

 is every reason, both geological and palaeontological, to l)elieve. We 

 have therefore in all 7 distinct localities from which fossils were got. 

 These localities sliow close aifi.nitv in their floras, as will be seen from 

 the following- table : — 



