CONTENTS 



Introduction page 262 



Aims, methods and terminology 263 



Previous work ....-•••••• ^"9 



Discussion of the methods employed in relation to recent advances in 



phytoplankton technique 276 



Division of the Antarctic zone into biogeographical regions and areas . 279 



Ecological grouping of the important phytoplankton species . . . 281 



Notes on the species 286 



Itineraries of the phytoplankton observations during the third, fourth and 



fifth commissions of the R.R.S. ' Discovery 11 ' 295 



Description of the observations obtained 30? 



The Northern Region 3°? 



The Intermediate Region 3^^ 



The Southern Region 3^4 



The South Georgia Area 3^7 



The Scotia Sea 3^9 



Other special areas 3^1 



Biological features of special interest 322 



Distribution with depth of the Antarctic phytoplankton ... 322 



The colonial habit in relation to environment 323 



Spore formation in Antarctic plankton diatoms 326 



The feeding of plankton organisms 327 



Discussion ......•••••• 3^9 



Summary 34° 



Acknowledgements 344 



References 345 



Appendix 34° 



