. Fig. 2. Observations of Rhizosolenia curvata in the South Atlantic Ocean. The richest catch from our meagre South Atlantic collection was obtained at St. 1197 on the sub-Antarctic side of the convergence. Another station of special interest is 670 which furnishes one of the very few records (only three in all) of the occurrence of R. curvata at temperatures higher than 8° C. OBSERVATIONS IN THE SOUTHERN INDIAN OCEAN AND SOUTH OF AUSTRALIA Our records of R. curvata for this area are not very numerous, but the majority were obtained on series of observations running more or less north and sout

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. Fig. 2. Observations of Rhizosolenia curvata in the South Atlantic Ocean. The richest catch from our meagre South Atlantic collection was obtained at St. 1197 on the sub-Antarctic side of the convergence. Another station of special interest is 670 which furnishes one of the very few records (only three in all) of the occurrence of R. curvata at temperatures higher than 8° C. OBSERVATIONS IN THE SOUTHERN INDIAN OCEAN AND SOUTH OF AUSTRALIA Our records of R. curvata for this area are not very numerous, but the majority were obtained on series of observations running more or less north and south through the full width of the sub-Antarctic Zone. The data thus provided were, therefore, particularly well suited to the purpose of this study, and will be seen to agree almost perfectly with the general theory of the distribution of the species. The results are shown in Table IV, and the positions of the stations have been plotted in Fig. 3. All the larger hauls of R. curvata in this sector occurred in the sub-Antarctic Zone,

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