Fig. 6. Phase shifts between the contraction cycle of the mantle and the contraction cycle of Point A on the anterior vena cava (AVC). Full expansion of the mantle is arbitrarily set at 0° and time proceeds clockwise. The heavy black line starts at the full contraction of Point A (AVC) and ends at the full expansion of Point A. The heavy grey line starts at full mantle contraction and ends at full mantle expansion. Each concentric circumference represents the averaged data of a different cuttlefish.