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

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