244 
ANNUAL REPORT SMITHSONIAN INSTITUTION, 1946 
grouped into four principal areas. These are indicated in figure 1, 
and numbered II-V. The tendency is confirmed by the independent 
marking records and other observations of the Discovery Committee’s 
ships. 
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DIRECTIONS OF MIGRATION 
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It is in each of these areas that we find one of the concen- 
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Ficure 1.—Segregation of the stocks of humpbacks. Large roman numerals 
indicate Hjort, Lie & Ruud’s areas II-V. Short meridional lines show the 
approximate limits of humpback concentrations in the Antarctic (pecked when 
uncertain). Arrows indicate the directions of migration. (From Mackin- 
tosh, 1942.) 
trations of humpbacks (a species which is not taken in sufficient num- 
bers itself to determine the distribution of the factory ships), but 
whereas the humpbacks are separated into almost completely isolated 
-groups, the blue and fin whales are found in all longitudes, and the 
grouping is represented only by rather larger numbers. It appears, 
