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"Esophageal Ring. Anterior end of nervous system of Polynoë, a polychaetous annelid, showing, a, cerebral ganglia, connected by the esophageal ring, b, with the ventral series of ganglia, c." -Whitney, 1911

Scale Worm Nervous System

"Esophageal Ring. Anterior end of nervous system of Polynoë, a polychaetous annelid, showing, a,…