large necklace shell, euspira catena. achmelvich bay, diving, scotland

achmelvich active adventure animal animalia assynt bay beach biology britain catena cold critter diving drysuit euspira gastropod gastropoda great green highland invertebrate large life lochinver marine mollusc mollusca moon natica naticoidea necklace ocean predatory sand sandy scotland scuba sea shell snail sutherland uk undersea underwater water wildlife