i6 2 DISCOVERY REPORTS 



1901-3, to H. van Heurck (1909) on the results of the voyage of the 'Belgica' from 

 1897 to 1899, to M. Petit (1908) and L. Mangin (1915) on the phytoplankton obtained 

 during the French Antarctic Expeditions, and to G. Karsten (1905) on the Antarctic 

 material collected by the ' Valdivia ' on the German Deep-Sea Expedition, 1898-9. Use 

 has been made of the Discovery Reports, particularly the papers of Dr T. J. Hart and 

 Mr G. E. R. Deacon, also the Station Lists in vol. iv from which positions and hydro- 

 logical data have been obtained. 



My thanks are due to Dr Stanley Kemp, until lately Director of Research, for making 

 available to me the log-books of the R.R.S. 'Discovery II' and the R.R.S. 'William 

 Scoresby ', from which data were obtained of the more recent commissions for which 

 Station Lists have not yet been published. 



My thanks are also due to Mr John Ramsbottom, O.B.E., Keeper of the Department 



of Botany of the British Museum, for allowing the major part of the work to be done in 



the Laboratories of the Department, and to Mr Geoffrey Tandy, Assistant Keeper of 



the Department of Botany, for the valued help received on the more intricate points of 



nomenclature, and the classical rendering of the descriptions of species described here 



for the first time. 



LIST OF STATIONS 



A list of the stations from which phytoplankton samples were examined is given be- 

 low. The station number, the geographical position and the date on which the sample 

 was taken are given. These are followed by certain hydrological data, which are ob- 

 servations at the surface of the water. Temperature is expressed in degrees Centigrade, 

 salinity as parts per thousand, phosphate content (P 2 5 ) as milligrammes per cubic 

 metre and the combined nitrite and nitrate content (N0 3 ) also as milligrammes per cubic 

 metre. The net used at all stations was the 50-cm. net referred to on p. 155; it was 

 hauled vertically and the depth of the haul is noted. Under each station a list of the 

 species of diatom is given, the species being arranged in order of abundance (pp. 163- 



199). 



SYNOPSIS OF STATIONS 

 R.R.S. 'Discovery': 



260-265 Off South-West Africa 



275, 289-294 Off west coast of Africa 



R.R.S. 'Discovery II': 



3°°-3°5 I 



334-34° I South Georgia 



475-483 S 



SOi-513, 



365-368, 626 South Sandwich Group 



378-388 South Shetlands to Cape Horn 



424-450 South Africa 



451-463 Cape Town to west of Bouvet Island 



54 2 -544 1 Bransfield Strait, South Shetlands 



551-553 J 



570-580 Bellingshausen Sea 



