siphonoglyph

from The Century Dictionary.

• noun In sea-anemones, one of the ciliated grooves at each end of the mouth leading down into the gullet. In alcyonarians, the groove is single. Also goniclial groove, and sulcus.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A longitudinal flagellated chamber found in most cnidarians in the classes Scyphozoa and Anthozoa, extending from the mouth towards the colenteron (body cavity).