JODRNAL OF THE COLLEGE OF SOTENOE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN. 



VOL. XXI., ARTICLE 2. 



Fossils from the Environs of Tokyo. 



By 



S. Tokunaga,* Eigakuhakushi. 



With 6 plates. 



Introduction. 



The Mesozoic palœontology of Japan has been studied by 

 many authors, such as Mojsisovjcs, Neumayr, Yokoyama, Jimbö, 

 Yabe, Nathoest, Geyler etc.; but that of the Cainozoic group 

 has received comparatively little attention. The only author 

 who has written about its plant fossils is Nathorst, who re- 

 cognized in them both Miocene and Pliocene forms. On the 

 Molluscan remains, Brauns' '* Geology of the Environs of Tokio^'"-'''^ 

 is the principal work. Its author studied shells collected chiefly 

 at Shinagawa and Oji, and described them as Pliocene. In the 

 same work he also added a few notes on fossils from various 

 other localities. After more than three years' careful study of 

 these so-called Japanese Pliocene fossils, I have arrived at a 

 conclusion differing from Brauns'. I have been several times 

 at Oji, Shinagawa and Tabata, and the number of species I 

 have collected far exceeds that mentioned in Brauns' list. The 

 collected specimens are now all preserved in the Science College. 



* Formerly Yoshiwara. 



** Memoirs of the Science Department, Tokyo Daigaku, No. 4, 1881, 



