Archive image from page 407 of Discovery reports (1932) Discovery reports discoveryreports05inst Year: 1932 392 DISCOVERY REPORTS of the total body length as against 7 per cent in the male sex. In the 2-1 m. foetus dissected in the present work, the distance between the centre of the anus and the centre of the vulva amounted to 5-75 cm. In toothed whales and the Balaenidae the anus lies within the hinder commissure of the vulva and is surrounded by the same sphincter. In view of this fact some doubt may be expressed whether the large fleshy lips that flank the vulva both in Mysticetes and to
Archive image from page 407 of Discovery reports (1932) Discovery reports discoveryreports05inst Year: 1932 392 DISCOVERY REPORTS of the total body length as against 7 per cent in the male sex. In the 2-1 m. foetus dissected in the present work, the distance between the centre of the anus and the centre of the vulva amounted to 5-75 cm. In toothed whales and the Balaenidae the anus lies within the hinder commissure of the vulva and is surrounded by the same sphincter. In view of this fact some doubt may be expressed whether the large fleshy lips that flank the vulva both in Mysticetes and toothed whales should correctly be called the labia majora. All previous authors, however, have given this name to the lips of the vulva of Balaenoptera. Anteriorly they converge in front of the clitoris, to form, as stated by Beauregard and Boulart, a long deep fold running forwards in the middle line (Plate III, figs. 1-3 ; Fig. 10). No sign was found in the foetus dissected, nor in any adult, of any anterior rounded elevation such as Turner (1870 a) found and identified with the mons veneris. A number of accessory grooves flank the vulva. The number and extent of these grooves varies in different individuals, but two pairs of them are always present and are constant in position. The mammary grooves form one of these pairs (Plate II, fig. 2; Plate III, figs. 1-2; Fig. 10 d). They contain the nipples and lie close to the labia majora on each side. In the 2-1 m. foetus the middle point of the mammary groove, where the nipple was situated, lay opposite the clitoris, i-6 cm. from the centre of the vulva. The other pair of grooves lies farther laterally (Plate III, figs. 2, 3 ; Fig. 10 e), one member of the pair on each side of the vulva. The grooves of this pair are very long and exhibit an anterior deep portion (Plate III, fig. 2) opposite the extreme anterior termination of the labia majora. In the 2-1 metre foetus the centres of these anterior grooves lay 1-25 cm. on either side
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