Abstract
1. 1. Lateral ciliary activity was studiedon isolated gill preparations of the mussel Mytilus edidis. 2. 2. Electrical stimulation of the branchial nerve at 5 Hz (increased) and 50 Hz (decreased) changed the average rate of ciliary beating. 3. 3. These modifications in the ciliary activity were significantly altered in specimens lacking an intact cerebrovisceral connective. 4. 4. It appears that the cerebral and visceral ganglia exhibit a coordinated role in the control of ciliary beating.
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