These lugworms were dug up on Rhos-on-Sea / Colwyn Bay beach. The lugworm or sandworm is a large marine worm of the phylum Annelida. The castings, or curly worm like mounds of sand are a familiar sight on a beach at low tide but the worm itself is not seen except by those who dig the worm out of the sand for fishing bait. Although these days they are more often than not sucked out of the sand by a bicycle pump like contraption. 
