-;(J4 M. YOKOYAMA; MEöOZOIC VLAXTS 



ill which I had already recognised the occurrence of the Middle Cretace- 

 ous Tritjoniac.'^^ The plant-bed consists of sliales and sandstones, and is 

 sometimes in such close relation with the Trigonia sandstone that it is 

 difficult to distinguish the boundary between the two. 



From Sakamoto I possess many small fragments of a dark grey 

 whale in which badly preserved molluscan shells are found, and a big 

 block of the same rock containing a single species of Zaiiii'ophijUum 

 Huchianuiii Ett. sp. 



At Fujikawa the plant-bearing rock is a dark-grey, hard, line- 

 grained sandstone Avliich is sometimes clayey and passes to shale. 

 Owing to the more or le.ss rough nature ol the sandstone, the preser\'a- 

 tion is fur from satisfactory, the minute details of tlie plants being in 

 most cases obliterated. The number of species found at this locality 

 is 5. 



The plants of Tanno are found in a dark brittle shale, exposed in 

 a valley called Kashiwaradani, deeply cut by a stream. The upper part 

 of this shale becomes sandy, and on it is superposed the Cretaceous 

 sandstone. Kikuelii found in pebbles probably derived from the 

 sandy part of the shale some remains of fresh-water molluscs. The 

 preservation of the plants is generally excellent, but we have only four 

 species from this locality and all in small fragments. 



From Hiura in Mitimi, near Sakamoto, Xathorst obtained o species, 

 but in my collection there is none which comes fnjm the same place. 



4. Kataji, Ishiseki, and Tögodani. 



These l<:.calities all lie in the Ryöseki " Hügelland " of Dr. 

 Naumann. The geological nature of this district has been recently 

 studied by Mr. ^1. Yamagami, now a geologist in tlie Imperial 



1) On Home L'n'taci'nii.'f Fossils frum Sliilwku. Op. cit. 



