GEOLOGIC STRUCTURE OF THE RIUKIU CURVE. 3 



witli geological specimens and inf(3rmation, either published or in 

 manuscript. Mr. T. Kuroiwa visited the islands of Kume, Ag*uni, 

 Tonaki, and the Iheya subgroup, and his notes in part appear in "T/jc 

 Journal of the Geological Societij of Tökijö.^' The uninhabited islands 

 lying at a distance from other ishmds of the Riukiu Curve have been 

 examined, formerly by the Prefectural officers, and also by Japanese 

 iind foreign naval officers, and recently by Messrs. M. Miyajima and 

 Ivuroiwa. In travelling through Okinawa-jima, I was with Prof. 

 Yokoyama, who gave me many kind suggestions respecting my 

 investigations. After having furnished my observations in the Riukiu 

 Islands, I spent about three months in crossing through the Oshima 

 group, visiting all members of the group except a few islets. The 

 geology of the islands lying between the Oshima group and Kyüshü 

 has been treated in Mr. K. Nishiwada's work on Yaku-shima and 

 Tanega-shima, which was published in " The Journal of Geofpnphy, 

 T()%ö" (1895). The Tokara group has been visited by Mr. M. 

 Yamas'ami: while the structure of a few remainino^ islands can be seen 

 in the General Geological Map of Japan (1:1.000.000) published in 

 1900 by the Imperial Geological Survey. 



As to the northern part of Formosa, Gordon, Jones, Hichthofen, 

 Swinhoe and Tyzack have written geological notes. Messrs. Y. Ishii, 

 K. Inoue and Y. Saitö have successively worked as chief geo- 

 logists to the local government of Formosa. The valuable reports 

 of these three observers have been published in Japanese. 



The present paper will treat of the geology of the northern part 

 of Formosa and of the islands lying between Formosa and Kyushu. 

 The results of my study of the raised coral reefs in Riukiu and Osumi 

 is embodied in another note. 



My sincere thanks are due to Prof. Jimbô who has with great 

 kindness given me his help in the revision of this paper. 



