Lug worm casts and blow holes were widespread over the low-tide sand at Pembroke Bay on the Channel Island of Guernsey when I visited in early October. They had a more scattered distribution and the casts were not so fine as those I have seen on other parts of the island at Rocquaine Bay and Cobo Bay. Two species of Arenicolidae have been recorded for Guernsey and I wonder if I have been looking at the burrows and traces of the two different types. Here on the beach at Pembroke Bay I think they could well be Arenicola marina (Linnaeus) whereas those I had photographed else where could be Arenicola ecaudata Johnston which prefers the rich mud between stones or in rock crevices at low water. Both types of cast are shown in the gallery below. Click to enlarge the images and see the descriptions.
Jessica's Nature Blog 