XVII. Observations on the nervous system of Aurelia aurita

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Abstract
Last August I undertook, at the request of my friend Mr. G. J. Romanes, an investigation with the view of proving the presence or absence of histologically differentiated nervous structures in the Medusae. Mr. Romanes’ experiments have shown the existence of a central nervous apparatus in the marginal bodies of these animals, and probably also of nervous tracts (lines of discharge) over the lower surface of the nectocalyx or umbrella. But up to the present time the anatomical proof of the existence of a nervous system in this class has rested chiefly upon the authority of Haeckel, who has described in two genera of the craspedote Medusæ a ring of nerve-fibres lying on the inner side of the marginal canal, and provided with a ganglionic enlargement at the base of each lithocyst. From each of these ganglia four nerves are described as passing—one to the polypite, and the others to the adjacent tentacles and lithocyst.

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