PLATE III 



Fig. i . Posterior ventral surface of the abdomen and tail of a female Fin 

 whale 22-65 m. in length. The position and relations of the external 

 genitalia and the accessory grooves is shown. 



Distance from centre of anus to centre of vulva 0-65 m. 



Distance between the nipples ... ... ... 0-51 m. 



Fig. 2. External genitalia of above. This whale was lactating and the 

 vulva is distended as in "heat", a, Clitoris, b, Labia majora. c, Labia 

 minora, d, Genital aperture, e, Urinary aperture. /, Corrugated fleshy 

 pad between the genital and urinary apertures. 



Fig. 3. Vulva of a foetal Fin whale. The labia majora are held apart by 

 means of a metal strip which has been passed under the vaginal band. 

 The genital opening lies immediately beneath the vaginal band and is 

 partly concealed by the metal strip, a, Praeputium of the clitoris. 

 b, Clitoris, c, Labia minora, d, Labia majora. e, Vaginal band. /, Mam- 

 mary groove, g, Urinary aperture. 



