BENSON.— Structural Features of the Margin of Australasia. 133 
South Island of New Zealand at the other— into which the Tertiary 
orogeny did not extend. Again, though late Tertiary and Pleistocene 
crust-movement (block-faulting) accompanied by volcanic and seismic 
activity extending up into modern times occurs more or less markedly 
throughout the whole zone, it apparently reaches its maximum in the 
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papers, in which the modern volcanic and seismic activity in the New 
Hebrides is but the continuation of the action of the same controls which 
paper. Professor Wanner communicated some useful comments on the 
previous paper and minor corrections. Professor Brouwer kindly read the 
portion of the manuscript dealing with the East Indies, and made very 
valuable suggestions. Dr. S. van Valkenburg, of the East Indian Topo- 
preparation of the diagrams. To all these gentlemen the writer's thanks 
are due. He desires especially to acknowledge his debt to Professor Sir 
Edgeworth David, who first aroused his interest in the fascinating problems 
which have herein been considered. 
