CONTENTS 



Introduction page 41 



Sounding equipment 42 



Deep-water echo-sounding set 43 



Shallow-water echo-sounding set 43 



Correction of echo soundings 48 



Difficulties of obtaining soundings 50 



Slope correction and the condition of the ocean floor 52 



Composition of the bottom 58 



Terminology of submarine relief 60 



The Scotia Arc 61 



Detailed analysis of the sectors of the Scotia Arc 68 



Tierra del Fuego to the Shag Rocks 68 



South Georgia and the Shag Rocks 70 



South Georgia to the South Sandwich Islands 71 



South Sandwich Islands to the South Orkney Islands 72 



South Orkneys to Clarence Island and the South Shetlands .... 74 



Soundings during hydrographical surveys 77 



South Orkneys Survey 78 



South Shetlands Survey 79 



Balleny Islands 82 



Tristan da Cunha Group 83 



Marion and Prince Edward Islands 84 



Bouvet Island 84 



Magellan Strait 84 



Soundings off Antarctica in the meridian of Greenwich 85 



The Continental shelf of Antarctica 86 



Soundings in other localities 88 



Discovery Bank 90 



The Ross Sea 92 



Kerguelen-Gaussberg ridge 94 



Appendix I 95 



Appendix II 98 



References 102 



Note on the plates 105 



Plates XXIII-XXXI following page 105 



