THE SEI WHALE 279 



whales in anoestrus. The neighbourhood of South Georgia represents the approximate 

 southern range of the migration, and individual whales do not usually stop there for 

 more than one month. Sei whales occur in greatest abundance in South Georgian 

 waters when the sea temperature is at its highest. Accounts of the sudden appearance 

 of large numbers of Sei whales on grounds where they were formerly scarce are 

 mentioned, but there is some doubt as to the accuracy of the observations on which 

 such statements are based. 



The Sei whale has not yet been of much economic importance on most of the world's 

 whaling grounds, particularly in the Antarctic. But it is suggested that when the 

 serious diminution in numbers of the larger and more profitable species, which appears 

 to be imminent, arrives, this species will suffer considerably and will be in danger of 

 being reduced to a very small remnant in a short time. 



REFERENCES 



Andrews, R. C, 1916. Monographs of the Pacific Cetacea. II — The Sei Whale (Balaenoptera borealis 

 Lesson). Mem. Amer. Mus. Nat. Hist., New Series, 1, Pt. vi, pp. 293-388. 



CoLLETT, R., 1886. On the external characters of Rudolphi's Rorqual (Balaenoptera borealis). Proc. Zool. 

 Soc. Lend., pp. 243-65. 



Haldane, R. C, 1904. Whaling in Shetland. Ann. Scott. Nat. Hist., pp. 74-7. 



1905. Notes on Whaling in Shetland, 1904. Ann. Scott. Nat. Hist., pp. 65-72. 



1907- Whaling in Scotland. Ann. Scott. Nat. Hist., pp. 10-15. 



1908. Whaling in Scotland for 1907. Ann. Scott. Nat. Hist., pp. 65-72. 



1909. Whaling in Scotland for 1908. Ann. Scott. Nat. Hist., pp. 65-9. 



1910. Whaling in Scotland for 1909. Ann. Scott. Nat. Hist., pp. 1-2. 



Harmer, S. F., 1928. The History of Whaling. Proc. Linn. Soc. Lond., pp. 51-95. 



I93I- Southern Whaling. Proc. Linn. Soc. Lond., pp. 85-163. 



Hart, T. J., 1935. On the Diatoms of the Skin Film of Whales, and their possible Bearing on Problems of 



Whale Movements. Discovery Reports, x, pp. 247-82. 

 Hinton, M. a. C, 1925. Report on the Papers left by the late Major Barrett-Hamilton, relating to the Whales 



of South Georgia. Crown Agents for the Colonies, London, 1925, pp. 57-209. 

 Kellog, R., 1929. What is known of the Migrations of some of the Whalebone Whales. Ann. Rep. Smithsonian 



Inst. Washington, 1928, pp. 467-94. 

 Laurie, A. H., 1937. The age of female Blue Whales and the effect of Whaling on the stock. Discovery Reports, 



XV, pp. 223-84. 

 Lillie, D.G., 1915. Cetacea. British Antarctic T Terra Nova') Expedition, 1910. Nat. Hist. Rep. Zoology, 



I, No. 3, pp. 85-124. 

 Mackintosh, N. A. and Wheeler, J. F. G., 1929. Southern Blue and Fin Whales. Discovery Reports, 



1. PP- 257-540. 

 Matthews, L. H., 1932. Lobster Krill. Discovery Reports, v, pp. 467-84. 

 MiLLAiS, J. G., 1906. The Mammals of Great Britain and Ireland, vol. in, London. 

 Parkes, a. S., 1926. The Mammalian Sex-Ratio. Biol. Rev., 11, pp. 1-51. 

 Report of the Interdepartmental Committee on Research and Development in the Dependencies of the 



Falkland Islands. Cmd. 657. H.M. Stationery Office, London, 1920, pp. 1-164. 

 RisTiNG, S., 1928. Whales and Whale Foetuses. Cons. Internat. Expl. de la Mer, Rapp. et Proc. Verb., 



L, pp. 1-122. 

 Thompson D'Arcy, W., 1919. On Whales landed at the Scottish Whaling Stations, especially during the 



years 1908-1914. Part VII. The Sei Whale. Scott. Nat., pp. 37-46. 

 True, F. W., 1904. The Whalebone Whales of the Western North Atlantic. Smithson. Contrib. Know., xxxiii, 



PP- 1-332- 



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