In this article we will discuss about the coelenteron of aurelia, explained with the help of a suitable diagram.
i. The coelenteron (Fig. 20.18) of Aurelia has been modified, and remains only along four meridional areas, the radial canals and as a circular canal.
ii. The mouth leads into a short gullet, which joins a large rectangular stomach.
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iii. The stomach is produced laterally into four inter-radial gastric pouches. Numerous gastric filaments are present on the floor of the gastric pouches and also at the junction of the gullet and stomach.
iv. At four corners of the mouth are four par radial canals, at right angles to each other.
v. Between these are four inter-radial canals.
vi. These eight canals are much branched.
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vii. Halfway between the par-radial and inter-radial canals are eight un-branched adradial canals—two of them arising from each gastric pouch.
viii. All the sixteen canals open into a marginal circular canal.
ix. The gullet, stomach with its gastric pouches, and all the canals constitute the enteron which is lined with ciliated endoderm cells.