Long cilia were observed on the lateral side of the primary and secondary gill bars (Fig.
The particles are then filtered from the water by cilia on the primary gill bars and tongue bars (Figs.
Long cilia located on the lateral sides of the gill bars probably mediate the pumping behavior and capture most of the particles from suspension, but a fuller experimental study would be necessary to demonstrate this conclusively.
Instead, heavily ciliated gill bars appear to secrete the mucus.
The food is gathered on the gill bars and transported from dorsal to ventral (in chordates, particles move from ventral to dorsal), and then tr ansported posteriorly to the gut in a mucous food cord.