Washed up at the rocky water’s edge. No idea what it is but the closest thing it reminded me of was Philine angasi - just a little. I thought it was a piece of a bigger animal at first but on looking closer (without my glasses...) it seemed to be an individual entity, internal organs and all.
Several views of some of the copious amounts of surface drift seagrass -mostly Posidonia I assume- which were a feature of a few shallow snorkels in area.Drifting along the shore on tide and wind. [Correct date is 04-12-2018,camera clock needed adjustment]
Not uncommon here,from shallowest subtidal to @ least ~5 m(which was ~ the maximum depth I achieved during the one shore dive at this site)