PHYTOPLANKTON OF SOUTH GEORGIA 



6s 



spineless chain form was rare. Only one species was recorded on the previous survey 

 that was not found early in the following year — Melosira sol — and that had been found 

 at only two stations in comparatively small numbers. 



Total phytoplankton organisms estimated: 2,341,067,800. 



The contrast in bulk between the two series of catches is also strikingly brought out 

 by the above list, and by the estimated totals — 6i millions as against 2341 millions. The 

 relative proportions of the small colonial forms on the second survey are of course 

 problematical, but their position at the head of the list is undoubtedly justified. In 

 calculating the percentages of the various leading forms it has only been possible to take 

 the estimated numbers into consideration, those forms that defied any method of estima- 

 tion being perforce left out of account. 



CONCLUSIONS 



COMPARISON WITH THE RESULTS OBTAINED IN 1926-7 



The results obtained on the two strikingly contrasted surveys described above may 

 be usefully compared with those for the December-January 1926-7 survey described by 

 Hardy (in press). On this occasion, as on the rich spring survey of November 1930, the 

 western Weddell Sea current again provided the richest samples, though it would seem 

 that the rich belt had undergone considerable mixing with old Bellingshausen Sea 

 water, and that the whole system had been pushed round and up the western side of the 

 island. It is probable that the extent of the influence of the western Weddell Sea 



