They are anemones but are in the Order Ceriantheria, tube dwelling anemones. Nice one. Pick a genus. I don't know the genus. Could be Cerianthus. Info below from ITIS
Integrated Taxonomic Information System-use it at work.
Kingdom Animalia -- Animal, animals, animaux
Phylum Cnidaria Hatschek, 1888 -- água viva, anêmona, caravela, cnidaires, cnidarians, cnidario, coelenterates, coelentérés, coral, hidra
Class Anthozoa Ehrenberg, 1834 -- água viva, anêmona, anémones de mer, antozoário, caravela, corais, corals, coraux, flower animals, gorgônia, sea anemones
Subclass Ceriantipatharia Van Beneden, 1898
Order Ceriantharia Perrier, 1893 -- tube-dwelling anemones, tube-dwelling anemones
Family Cerianthidae Milne-Edwards and Haime, 1852
Direct Children:
Genus Arachnactis M. Sars, 1846
Genus Ceriantheomorphe Carlgren, 1931
Genus Ceriantheopsis Carlgren, 1912
Genus Cerianthus Delle Chiaje, 1830
Genus Isodactylactis Carlgren, 1924
Genus Pachycerianthus Roule, 1904
Genus Synarachnactis