JOURNAL OF THE COLLEGE OP SCTENCE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN. 



VOL. XXI., ARTICLE 5. 



A Contribution to the Genus Fusulina, with 



Notes on a Fusulina-Limestone 



from Korea. 



By 



H. YABE, Eigahushi. 

 Lecturer in Gcolooy, Sei. Coll., Imperial Univor.sity of Tokyo. 



With 3 phites. 



Tlio recent advance in our knowledge of tlie Permoearbon- 

 iferous Foraminifera is largely due to tlie works of Prof. E. 

 ScHELLWiEX. He studied, among other forms, those in the Carnic 

 Alps, found the long accepted separation of the genera, FusuUna 

 and Schwager'nia, to be of only a subgeneric value, and accord- 

 ingly united them under the one genus Fusulina, which ho 

 proposed to divide into three subgenera. To me, however, it 

 seems more natural to subdivide it into four. 



In the following descriptions of these four subgenei'a, I pro- 

 pose the use of the designations, primary-, auxiliary- and trans- 

 verse septa. By primary septa, I mean those longitudinal partitions 

 marked on the surface as deep sutures,^^ and commonly called 

 'septa.' The auxiliary septa are those parallel to the former, but 

 showing no suture on the outside ; for they are mere stalactitic 



1) The origin of the suture on the surface is evident from tiie explanation of Schellwiex 

 on the formation of the septa. 



