The Opisthobranchiate Mollusca of the Branner Agassiz Expedition to Brazil

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), passes backward to the ctenidium, and several very delicate nerves are also given off to the pericardial wall and are lost among its fibres.
Visceral nerves. The left, or visceral ganglion is equal in size to the right parietal one. At its anterior, more pointed end it TETHYS CERVINA BALL AND SIMPSON 53 receives the distal end of the left pleuro- visceral connective. From its posterior portion it gives origin to the following four nerves.
1. From near the posterior median line arises a slend
...er nerve (PI. X, fig. 42, /. V. /), which immediately bifurcates to the Vesicle of Swammerdam, or spermatotheca, and its duct, a slender branch being also continued to the adjacent peritoneum.
2. A large nerve (PI. VIII, fig. 35, /. V. 2), given off from the posterior right side of the ganglion, passes obliquely backward to the right, crossing the large hermaphroditic duct midway of its length, to the posterior end of the body. It gives off a number of slender branches to the dorsal peritoneum, and a larger one, 20, to the liver, separating from the main nerve near its origin, but continued with it in a common epineural sheath for some distance.


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