1. 1.

    The anatomical location of the control centre(s) for the endogenous tidal rhythm of swimming activity shown by Corophium volutator (Pallas) has been investigated using a selective chilling technique.

  2. 2.

    Rephasing occurred on chilling the whole animal to −3 °C or on chilling either the supra- or sub-oesophageal ganglion alone, whereas cold pulses applied to the telson or mid-body regions were without effect.

  3. 3.

    Ablating the eyes had no effect on the endogenous rhythm.

  4. 4.

    The results are interpreted in terms of two autonomous control centres.

This content is only available via PDF.