. J JASONDJ FMA MONTHS Text-fig. 30. Mean curve of foetal growth and monthly foetal length frequencies of southern hemisphere fin whales; class interval 0-2 m. November, and the higher size groups of the March and April samples, to overcome this bias. The effect of this small error on the frequency distribution of pairing, which is now to be calculated, means that the pairing frequencies for the early months of the breeding season and for the late months will be slightly under-rep resented. This is thought to have a negligible effect on the shape of the pairing curve. The effect of individual
. J JASONDJ FMA MONTHS Text-fig. 30. Mean curve of foetal growth and monthly foetal length frequencies of southern hemisphere fin whales; class interval 0-2 m. November, and the higher size groups of the March and April samples, to overcome this bias. The effect of this small error on the frequency distribution of pairing, which is now to be calculated, means that the pairing frequencies for the early months of the breeding season and for the late months will be slightly under-rep resented. This is thought to have a negligible effect on the shape of the pairing curve. The effect of individual variation in growth-rates must also be considered. Zemskiy (19500) states that male and female foetuses grow at different rates. Kimura (1957, p. 113) studied the difference in length between twins of different sexes, but found that in 57 % of cases there was no difference, and the remainder were almost equally divided between pairs in which the female was larger and pairs in which the male was larger. No distinction as to sex need, therefore, be made in studying foetal growth. We are concerned here with the average growth of large numbers, so individual variations in the growth-rate need not be considered in drawing up an average growth curve. When foetal lengths are
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