Definitions from Wiktionary (radial canal)

▸ noun:  any of the numerous minute canals lined with choanocytes which radiate from the paragastric cavity in some sponges and end just below the surface of the sponge
▸ noun:  any of the canals extending through the substance of the umbrella from the gastric cavity to the marginal circular canal in jellyfish
▸ noun:  a tube extending outward along each ambulacral area from the circumoral canal in most echinoderms


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