Phosphoric pennatula or sea-pen. Pennatula phosphorea. Pink sea-pen, a colonial marine cnidarian, named for their resemblance to feather quill pens. "This curious animal emits a very strong phosphoric light, and it is even so luminous that is is no uncommon circumstance for the fishermen to see the fish which happen to be swimming near it, merely by the light of the pennatula.". Illustration signed S (George Shaw).. Handcolored copperplate engraving from George Shaw and Frederick Nodder's "The N