Discovery reports (1959) Discovery reports discoveryreports29inst Year: 1959 TOOTHED WHALES 287 For example, in the sheep WtQ = 2i-6 days and LtQ = 2i days. In the present paper Lt is assumed to be 0-9 X WtQ, and Huggett and Widdas's scale of estimates of Wt is converted by this factor. Huggett and Widdas state that the growth velocity found by their method for blue and fin whales is 'at least 2 times greater than the highest rate found for all other mammals, and about 10 times greater than the rate for Primates'. They remark that it' would be interesting to see if these high rates are pecul
Discovery reports (1959) Discovery reports discoveryreports29inst Year: 1959 TOOTHED WHALES 287 For example, in the sheep WtQ = 2i-6 days and LtQ = 2i days. In the present paper Lt is assumed to be 0-9 X WtQ, and Huggett and Widdas's scale of estimates of Wt is converted by this factor. Huggett and Widdas state that the growth velocity found by their method for blue and fin whales is 'at least 2 times greater than the highest rate found for all other mammals, and about 10 times greater than the rate for Primates'. They remark that it' would be interesting to see if these high rates are peculiar to the large whales or are the same in related species of smaller size'. It is generally considered that the Odontocetes are on average on a lower grade than Mysticetes (Simpson, 1945) and in general they are smaller, so they will now be discussed in this order. Conspicuous modifications in the shape as well as the magnitude of the foetal growth curves of the Mysticetes as compared with the Odontocetes then become apparent. TOOTHED WHALES (ODONTOCETI) Data on the foetal growth of the sperm whale given by Matthews (19380), Mizue and Jimbo (1950), and Clarke (1956) have been used. As the full original data are not given the mean monthly foetal lengths have been taken from the graphs and the Japanese measurements have been converted from • SANRIKU o HOKKAIDO a AZORES UJ I I- o z M D J F '—•' MONTHS Text-fig. 2. Foetal growth in length of northern hemisphere sperm whale, Physeter catodon (points represent monthly means). In drawing the average growth curve only the North Pacific data have been used. feet to metres in the interests of uniformity. Although great care was exercised, some small errors may have resulted from this treatment, but it is thought that they do not affect the conclusions drawn. These data are set out graphically for northern and southern hemisphere sperm whales in Text- figs. 2 and 3. The average neonatal lengths are taken to be 3-92 m. in the nor
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