Tube-Worm Holes in Ringstead Chalk Boulders 6 – Detail of tube-worm burrows in a chalk beach boulder with attached limpet and common periwinkle. The burrows are mostly unoccupied by the worms and mostly lack the mucus and sand-grain tube linings. Holes most probably made by Spionid polychaete worms of the Polydora genus. Photographed at Ringstead Bay in Dorset, England.
Jessica's Nature Blog 