Show how sea urchins travel sea urchins or sea eggs have a queer method of locomotion they are protected by harp seines but thee spines do not coyer all the surface this Is divided up into segments like a rough melon the narrow segments are pierced with holes through these small holes the sea eggs protrude little tubes which act as feet in the following curious way the animal inflates the tubes in the water from little suckers at the back and in this way it pushes itself tor ward the tubular feet are fitted to every side of the creature which Is thus enabled to move in any direction it pleases |