PHYTOPLANKTON 



4' 



organisms at different stations. In considering these differences we must always re- 

 member that when contrasting hauls where the organisms are very numerous with hauls 

 where they are much less numerous, the actual ratio of the numbers in the sea at the 

 contrasted stations will be greater even than the ratio shown by the comparison of 

 numbers in the samples collected. The laboratory errors in the estimation of the 

 numbers in the samples have already been discussed on pp. 26, 27, where the 

 methods of analysis are described. 



LIST OF PHYTOPLANKTON SPECIES 

 Those shown in heavy type were the more important in this survey. 



DIATOMALES 



Melosira hyalina, Karsten. 



M. sphaerica, Karsten. 



Coscinodiscus bouvet, Karsten. 



C. centralis, Ehr. 



C. concinnus, W.Sm. 



C. curvatulus, Gran. 



C. excentricus, Ehr. 



C. horridus, Karsten. 



C. kerguelenensis , Karsten. 



C. lineatus, Ehr. 



C. oculoides, Karsten. 



C. oppositus, Karsten?. 



C. quinquies-marcatus, 1 Karsten. 



C. spiralis, Karsten. 



C. sub-bulliens, Jorgensen?. 



C. subtilis, Ehr. 



C. stellaris, Roper. 

 Coscinodiscus spp. 

 Actinoptychus undulatus, Bail. 

 A. vulgaris, Schum. 

 Asteromphalus brookei, Bail. 

 A. challenger ensis, Castr. 



A. hookeri, Ehr. 



A. parvulus, Karsten. 



A. regularis, Karsten. 



Asteromphalus sp. 



Actinocyclus antarcticus, Karsten. 



Stephanosira decussata, Karsten. 



Thalassiosira antarctica, Karsten. 



Dactyliosolen antarcticus, Castr. 



D. lacvis, Karsten. 

 Corethron valdiviae, Karsten. 

 Rhizosolenia alata, Brightw. 

 Rh. antarctica, Karsten. 



Rh. bidens, Karsten. 

 Rh. chunii, Karsten. 



Rhizosolenia curva, Karsten. 



Rh. obtusa, Hensen. 



Rh. polydactyla, Castr. 



Rh. rhombus, Karsten. 



Rh. simplex, Karsten. 



Rh. shrubsolei, Cleve. 



Rh. styliformis, Brightw. 



Rh. truncata, Karsten. 



Rhizosolenia sp. 



Chaetoceros atlanticus, Cleve. 



Ch. castracanei, Karsten. 



Ch. criophilutn, Castr. 



Ch. cruciatus, Karsten. 



Ch. curva t us, Castr. 



Ch. dichaeta, Ehr. 



var. tenuicornis, Mangin. 

 Ch.flexuosus, Mangin. 

 Ch. neglectas, Karsten. 

 Ch. radiculum, Castr. 

 Ch. schintperianus , Karsten. 

 Ch. socialis, Lauder. 

 Ch. tortissimus, Gran. 

 Biddulphia polymorpha, Mangin. 

 B. striata, Karsten. 

 Eucampia antarctica (Castr.), Mangin, 



balaustium and molleria. 

 Fragilaria antarctica (Schwartz), Castr 

 Fragilaria sp. 



Synedra spathulata, Schimper. 

 Thalassiothrix antarctica, Schimper. 

 Navicula oceanica, Karsten. 

 Gyrosigma (Pleurosigma) directum, ( Jrunow . 

 Scoliopleura pelagica, Karsten. 

 Tropidoneis antarctica, Grunow. 

 Chunniella antarctica, Karsten. 

 Nitzschia seriata, Cleve. 



types 



May include more than one species. 



