PLATE XII. 



Fig. 1. — The 'lava-delta^ of u soeonclaiy lava-flow in the eastern field after 

 the pattern of the * bird-foot delta of the Mississippi.' The digitiforin area 

 has ramifying axial canals Mdiosc seaward extremities each terminate at 

 the 'gas-spouting horn/ h. Photo by Prof Omori, taken on April 24th^ 

 1915. (One Mi' in the picture is to be deleted.) See pages 16, 16, 30, 

 108, 109. 



Fig. 2. — Nearer view of a 'gas-spouting liorn,' /;, of the preceding (Fig. 1, li). 

 Photo by Prof Ômori. See pages 108, 109. 



Fig. 3. — The lobatc marine lava-field in tJie iccsteni field with the foundered 

 central arena encircled by a row of fumarolcs. Cf. PL IX. Fig. 1. 

 Photo by Mr. Yamaguchi, taken on January 4th, 1915. Sec pages 25, 

 26, 27, 109, 110, 141, 148. 



