Note 70 — Chapter III

Fritz Müller first demonstrated a nervous system in the Polyzoa:—“The nervous system of each branch consisting of—1st, a considerable sized ganglion situated at its origin; 2nd, of a nervous trunk running the entire length of the branch, at the upper part of which it subdivides into branches, going to the ganglia of the internodes arising at this part; and 3rd, of a rich nervous plexus resting on the trunk, and connecting the ganglia just mentioned, as well as the basal ganglia of the individual polypides.” For further account, see paper in the “Micros. Journ.,” vol. i., New Series, p. 330.