DISTRIBUTION OF PHYTOPLANKTON 



57 



no doubt that the numbers actually present in the columns of water must have been 

 considerably greater— probably many times as great since the catching power of the 

 net would be so much reduced by the clogging of the meshes. At no fewer than 

 fourteen stations more than a million of the diatom were recorded. It is present in 

 large numbers both in water of Weddell Sea origin and in Bellingshausen Sea water. 

 Its distribution is shown in Appendix I and Fig. 28. 



• ^ "1 " r ~ 



□ < 10,000 



D I0.O00-50.OO0 



^2 50,000-100000 

 I 1100,000- 150,000 



»' 37' 



JO' 35" 





□ 



u 



a 



G 



J 



Fig. 27. Distribution of Chaetoceros schimperianus round South Georgia in the December-January 1926-7 

 survey. The square with an asterisk represents a value of 410,000. For full explanation see legend of Fig. 16. 



Ch. tortissimus, Gran, was recorded in small numbers at only one station to the 

 east of the island: WS 112. 



Biddulphia. 



Two species were recorded. B. striata, Karsten, was found round South Georgia in 

 the December- January survey in 1926-7 and was distributed both in water of Weddell 

 Sea and Bellingshausen Sea. Its distribution and numbers are shown in Appendix I 

 and Fig. 29. 



B. polymorpha, Mangin, was only found at St. 161 in small numbers. 



