3o6 DISCOVERY REPORTS 



fin and humpback whales and for the northern sei whale are estimated to be yo, 6-4, 4-56 and about 

 4-4 m. The corresponding birth weights are 2500 kg. (2-46 tons), 1900 kg. (i-86 tons), 1300 kg. 

 (1-28 tons) and 650 kg. (0-64 tons). 



8. Most of this growth takes place in the last 2 months of pregnancy. In the blue whale the 

 average gain in foetal weight during this period is over two tons. 



REFERENCES 



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Brinkmann, a., 1948. Studies on Female Fin and Blue Whales. Hvalradets Skr. nr. 31, 1-38. 



Brown, S. G., 1957. Whale Marks Recovered During the Antarctic Whaling Season 1956157- Norsk Hvalfangsttid. 46 Arg. 



(10). 555-9- 

 Chittleborough, R. G., 1953. Aerial Observations on the Humpback Whale, Megaptera nodosa {Bonnaterre), with Notes on 



Other Species. Aust. J. Mar. Freshw. Res. vol. iv (2), 219-26. 

 1^54. Studies on the Ovaries of the Humpback Whale, Megaptera nodosa {Bonnaterre), on the Western Australian Coast. 



Aust. J. Mar. Freshw. Res. vol. v (i), 35-63. 

 1958. The Breeding Cycle of the Female Humpback Whale, Megaptera nodosa {Bonnaterre}. Aus. J. Mar. Freshw. Res. 



vol. IX (i), 1-18. 

 Clarke, R., 1956. Sperm Whales of the Azores. 'Discovery' Rep. vol. X.KVIII, 237-98. 

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 DOAN, K. H. and Douglas, C. W., 1953. Beluga of the Churchill Region of Hudson Bay. Bull. Fish. Res. Bd Can. no. 98, 



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 Grieg, J. A., 1889. Cetologiske Notiser. Bergens Mas. Aarb. 1889, pp. 8-16. 



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Guldberg, G., 1886. Bidrag til Cetacernes Biologi. Om fort plant ningen og draegtigheden nos de nordatlantiske barde-hvaler. 



Farh. Vidensk. Selsk. Krist. 1886, pp. 1-56. 

 1894. On the Developtnent and Structure of the Whale. IV. On the Duration of Gravidity in Certain Odontoceti. Bergens 



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 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. 

 HuBBS, C. L., 1958. Natural History of the Gray Whale. XVth Int. Congr. Zool., Sect. HI, paper 46 (abstr.). 

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 Jonsgard, a., 1 95 1. Studies on the Little Piked Whale or Minke Whale (Balaenoptera acuto-rostrata Lacepede). Norsk 



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(2), 57-65- 

 Kakiava, Z., Kawakami, T. and Iguchi, K., 1953. Biological Investigation on the Whales Caught by the Japanese Antarctic 



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no. 8, 31. 



1958. Age Determination of Whales by Means of the Corpora Albicantia. XVth Int. Congr. Zool., Sect. Ill, paper 36, 



(abstr.). 



Mackintosh, N. A. and Brown, S. G., 1956. Preliminary Estimates of the Southern Populations of the Larger Baleen Wliales. 



Norsk Hvalfangsttid. 45 Arg. (9), 469-80. 

 Mackintosh, N. A. and Wheeler, J. F. G., 1929. Southern Blue and Fin Whales. 'Discovery' Rep. vol. i, 257-540. 

 Mark, J. W. S., 1956. Euphausia superba and the Antarctic Surface Currents. Norsk Hvalfangsttid. 45 Arg. (3), 127-34. 



