. in in c -^ o x: r 14 15 12 13 Total Length in metres • Non parous O Involuted ® JnTermediaTe ? Lactating" Fig. 52. Humpback whale. Females. Size of mammary gland. The great thickness of the mammary glands in all their stages when compared with those of Fin and Blue whales is striking, especially when it is borne in mind that the length of the gland is not much less than in those species. The length in Fin and Blue whales is given as about 2 m.: no measurements of length are recorded in the present series, but Lillie (1915) records that in a 40 ft. humpback at New Zealand the gland was 5
. in in c -^ o x: r 14 15 12 13 Total Length in metres • Non parous O Involuted ® JnTermediaTe ? Lactating" Fig. 52. Humpback whale. Females. Size of mammary gland. The great thickness of the mammary glands in all their stages when compared with those of Fin and Blue whales is striking, especially when it is borne in mind that the length of the gland is not much less than in those species. The length in Fin and Blue whales is given as about 2 m.: no measurements of length are recorded in the present series, but Lillie (1915) records that in a 40 ft. humpback at New Zealand the gland was 5I ft. long (approximately 12-25 m. body length: 17 m. gland length). It appears then that the mammary gland of the Humpback will produce much more milk in proportion to the length of the whale than in whales of the genus Balaenoptera. This point is dis- cussed further in a later section in connection with the growth of the young. Gestation and breeding season. In addition to the records of foetal length collected in South Georgia and South Africa, particulars relating to a few pregnant female Humpback whales from the South Indian Ocean are available. In the season 1932-3 Mr A. H. Laurie examined a series of whales on board the Southern Whaling and Sealing Company's floating factory ' Southern Princess' in that area. In the month of November 1932 nineteen female Humpback whales were captured, and details of eight are given in Table XVI. In the British Museum statistics relating to whaling there is an extensive list of dated records of foetal Humpback whales, given here in Table XVII.
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
