Filogranula annulata. A.- Operculum. B.- Section of the tube showing the peristomes. C.- Thoracic neuropodial hook. D, E.- Thoracic limbate chaetae (D: frontal view, E: Lateral view). F.- Apomatus chaetae. G.- First chaetiger special chaetae. H.- First chaetiger capillary bilimbated chaetae. Scale bars in microns.