Nemertea worm off the Palm Beach coast

From Wikipedia: Nemertea is a phylum of invertebrate animals also known as ribbon worms or proboscis worms [1]. Most of the 1,400 or so species are marine, with a few living in fresh water and a small number of terrestrial forms; they are found in all marine habits, and throughout the world's oceans [2]. Nemerteans are named for Nemertes, one of the Nereids of Greek mythology, and alternative spellings for the phylum have included Nemertini and Nemertinea.