(Montagu, 1804)
Description:
Crown with up to 200 radioli with a low web, in 1-4 spirals. Each radiole with 2-3 eye spots. Palps short, connected by the upper lip.
Collar dorsally and ventrally incised, with two ventral lappets deeply pigmented except for the border and a wide gap between dorsal margins (B. volutacornis-detail). Ventral ends of tori and adjacent ventral shields close together. Usually eight thoracic chaetigers.
Size:
Up to 150 mm for 100 chaetigers.
Tube:
Membranous, colourless, terminally encrusted with mud.
Colour:
Body greenish or violet; crown white, pale green or violet.
Habitat:
Sublittoral and in deep pools.
Distribution:
Eastern North Atlantic to Mediterranean, English Channel and northern North Sea.