JEB -- Ridgway et al. 204 (22): 3829 Figure IG9

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Fig. 9. A dorsal view showing the large vestibular sacs (V) on either side of the blowhole (B). F, fatty melon tissue; M, muscle. The vestibular sacs are important reservoirs holding air for recirculation for sound production, especially during dives. Scale bar, 5 cm.