202 DISCOVERY REPORTS 



verify that the pattern of distribution found in that Hne was not pecuHar to one area, a line in 80° W 

 (in the Pacific Ocean sector) and another in 90"^ E (in the Indian Ocean sector) were also examined. 

 The line in 80° W was also worked in March, and that in 90''^ E in February, so seasonal differences 

 should not affect the comparison greatly. In addition to these summer lines it was obviously desirable 

 to find out if the pattern of distribution altered much in winter, and for this purpose a line of stations 

 in 0° worked in August 1938 was chosen, and by analogy with the consistent pattern of distribution 

 shown by the three summer lines it was considered that the winter pattern of distribution in o^ could 

 be taken as circumpolar. There were two lines of stations worked in August in the Indian Ocean sector 



Fig. I. The positions of the stations used for the sections (Figs. 3,5,7,8, 10, 11 and 13), the positions of the convergences and 

 the approximate northern boundaries of the Weddell and East Wind Drifts. STC = Subtropical Convergence. AC = Antarctic 

 Convergence. WD = Weddell Drift. EWD = East Wind Drift. = Summer Stations. X = Winter Stations. 



(though none in the Pacific in that month) which could have been used for comparison, but owing to 

 the bad weather so prevalent in the Antarctic at that time of year neither of them was complete, and 

 a precise comparison would have been unsatisfactory. Inspection of the samples, however, shows that 

 the winter distribution of the Chaetognatha there is quite in line with what is found in 0°. 



The data used are those from the 70 cm. vertical closing nets (N 70 V) fished through horizons 

 from 1500 m. to the surface (the horizons being 1500-1000, 1000-750, 750-500, 500-250, 250-100, 

 100-50 and 50-0 m.). While these nets do not sample adequately the larger zooplankton, there 

 is no doubt that the medium- and small-sized animals are taken satisfactorily, and the advantages 

 of having nets which have fished accurately known depths, which have been closed before being 



