PLATE XXXI 



Fig. I. Blue whale, $, No. 1299. Ventral view. Showing transverse 

 white patches just behind the umbilicus in the centre of the photograph. 



Fig. 2. Blue whale, 3, No. 1345. Under surface of flipper, showing 

 heavy pigment. 



Fig. 3. Blue whale, (J, 1350. Ventral view of tail showing striations on 

 the under surface of the flukes. 



Fig. 4. Blue whale, 3, No. 157. Ventral view showing genital aperture 

 and ventral grooves. 



