62 



DISCOVERY REPORTS 



Fig. 32. Distribution of Thalassiothrix antarctica round South Georgia in the December-January 1926-7 



survey. For full explanation see legend of Fig. 16. 



DINOFLAGELLATA 

 Peridinium. 



As explained in the introduction to this section on the phytoplankton, the genus 

 Peridinium has not been important in the present survey, and no attempt has been made 

 in the time available to identify species in the routine process of analysis. Their total 

 numbers are given in Appendix I. The following species have, however, been noted at 

 the stations given after their names, but it must be understood that they are not limited 

 to these stations: 



P. antarcticum, Schimper: St. 161 and WS41. 



P. depressum, Bail.: WS no, WS 112 and WS 113. 



P. elegans, CI. (var. Karsten): WS 67 and WS 69. 



P. mimttissimum, Mangin : WS 40. 



P. turbinatum, Mangin: St. 161. 



P. castaneiforme, Mangin?: St. 161. 



P. pentagonum, Gran?: St. 41 C. 



