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Since the anchor is more easily handled at the stern , it is advisable to anchor by the bow only when necessary . Since mosses do n't have roots , using rhyzoids to anchor themselves to soil or rock or wood , most species can be gently collected by hand or with a spatula or flat-edged spade and transplanted onto soil that 's been minimally raked to give the plant a foothold . Finally , the leeches ( Hirudinae ) have no chaetae , instead having suckers on the anterior and posterior ends to anchor themselves to the substrate . Ticks have a harpoon-like structure in their mouth area , known as a hypostome , that allows them to anchor themselves firmly in place while sucking blood . Likewise he bade word be carried to his chief officer , that if against present expectation the ship was not brought to anchor by sunset , he need be under no concern , for as there was to be a full moon that night , he ( Captain Delano ) would remain on board ready to play the pilot , should the wind come soon or late . They must have been some sort of little octopus , with the bright glass bladder , big as smallish narrow pears , with a blue frill along the top to float them , and the strings to feel with - and perhaps the long string to anchor by . Crew aids permit the astronauts to maneuver safely or to anchor themselves in one location while working in the weightlessness of space .