Discovery reports (1938) Discovery reports discoveryreports17inst Year: 1938 THE HUMPBACK WHALE 39 this value, but are too scanty to allow one to conclude definitely that the southern Humpbacks have more ventral grooves than the northern ones. Table XII. Humpback whale. Numbers of ventral grooves No. of ventral grooves Males Females 21 2 —, 22 28 — I 3° — I 32 36 2 I I Average no. Maximum 26 32 31 36 Minimum 21 28 At the posterior end the median grooves run back to the umbilicus, while the lateral ones are progressively shorter the farther they are from the median line. Between the umbilicus

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Discovery reports (1938) Discovery reports discoveryreports17inst Year: 1938 THE HUMPBACK WHALE 39 this value, but are too scanty to allow one to conclude definitely that the southern Humpbacks have more ventral grooves than the northern ones. Table XII. Humpback whale. Numbers of ventral grooves No. of ventral grooves Males Females 21 2 —, 22 28 — I 3° — I 32 36 2 I I Average no. Maximum 26 32 31 36 Minimum 21 28 At the posterior end the median grooves run back to the umbilicus, while the lateral ones are progressively shorter the farther they are from the median line. Between the umbilicus and the genital aperture, especially in females, there is frequently a short, transverse, curved groove arranged with its convexity directed forwards (Fig. 40). On the other hand. Fig. 41 shows a shallow median groove joining the umbilicus to the Umbilicus Vulva

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