radial apophysis
From ZooTerms (Dictionary of Invertebrate Zoology)
radial apophysis: (Arthropoda: Chelicerata) In Arachnida, a copulatory organ on the male palp. radial canal (Cnidaria: Scyphozoa) A canal in the mesoglea of a medusa running from the center to the edge, or at least in part.
