Fig. 8. E pulses evoked by crushed amphipod juice applied to the manubrium. (A) Amphipod juice was applied to the manubrium at the time indicated by the arrow. A train of E pulses was evoked, recorded with electrodes on the manubrium itself and on the marginal nerve ring. (B) A single E event on an expanded time scale. All E events in the train appeared in the manubrium first and were conducted to the margin.