Tube-Worm Holes in Ringstead Chalk Boulders 3 – Chalk seashore boulder with tube-worm holes that are still occupied by the living worms, most likely Spionid polychaetes of the Polydora genus, at Ringstead Bay in Dorset, England. Within the chalk burrows the sand, mud and mucus tubes made by the worms are visible.
Jessica's Nature Blog 