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1. The Mogi fossil flora of the province of Hizen is one of the earliest and best known of the Cenozoic floras of Japan. One day in October, 1879, Nordenskiold' of the Vega Expedition visited the coast of Mogi near Nagasaki and collected numerous impressions of plant leaves in a tuffite exposed at the base of the cliff of Shiroiwa. These fossils were subsequently studied by A. G. Nathorst,2' who found in the material about 50 species determinable with reasonable certainty. Great many of the components of the fossil flora are assignable to the plants now living in Japan, and yet there are more species (52%,, after R. Florin3)) which are apparently now extinct from the islands. Noteworthy is the fact, among others, that the most dominant type of the fossils is Fagus ferruginea, which is now living in the Atlantic North America. According to Nathorst and Florin, there is one more Atlantic North American element, Taxodium distichum, and a Himalayan one, Rhus griffithii, in the fossil flora. In this connection, it will be added that the leaves assigned by them to Fagus ferruginea are also hardly distinguishable from those of Fagus ferruginea forma rosthornii figured by Ettingshausen' on the specimens collected by Arthur. v. Rosthorn from Sentsao-ping in Nanchuan district, province of Ssuchuan, China ; hence this type of fossil leaves may likely point to an affinity of the Mogi flora to the recent vegetation of China rather than to that of the Atlantic North America. 2. From the very nature of the fossils now we concern, there is no doubt much uncertainty regardingto the specific determination by Nathorst and Florin, and some of them seem to need revision.

Mogi Fossil Flora of the Province of Hizen and Its Geological Significance