28 



APiT. 



-B. KOTO : 



sharply-pointed wooded islets on the north (Heda-Kojima/M24??z.) 

 and south (Oki-Kojiraa, 100 ?».), both being built up of 

 columnar ash-stone or piperno. A low patch (Beuten,-^ 40 m.) 

 between tlie two is of the same jointed rock, silicified and 

 pyritiferous, and colored brown through submarine decomposition, 

 besides a cliff- rock (Ippai-jima) near the north island. The surround- 

 ing sea is 20 fathoms deep. The whole group, therefore, consists of 



Pig. 5.- ^\'este^u view of Kukubn-Jvujiina. 

 H.— Iltda-Kojiina. B. — Benten-jima. O.— Oki-Kojimn,. 



Fig. 6.- -Eastern view ol: Kolailm-Kojimn. 



1) i^ H /> a 



2) K. Yamaguchi {Geogr. Jour. Tokyo, No. 2, 1915) lately visited the islets and found a 

 patch of tufl&te which is said to contain various diatoms. The same species recur in the 

 Tertiary bed on the pass, east of the village of KajDd on the opposite coast of the mainland. 

 Diatoms and coral beds are also said to occur in the above-mentioned Héda-Kojima, but their 

 'stratigraphie positions are entirely unlcnown. 



