"SEA URCHINS" "A Documentary by JEAN PAINLEVE" "The sand urchin." "While the urchin digs in with its movable spines, sand enters its mouth which it cannot close." "The intestine is thus filled with sand whose nutritive particles it digests." "The rock urchin." "The greatest magnification possible using a Micro Ciné projector is about 200,000 times on a regular 9' x 12' screen." "The sea urchin moves by means of sinuous spines that end in suckers (white spots)." "How a sucker projects itself outward." "SURFACE OF SEA URCHIN" "WATER-FILLED POUCH" "SPINE" "SUCKER" "The sea urchin walk." "In the forest of spines we see numerous pedicellariae-." "three jaws connected to the sea urchin by a calcareous stem." "Between 1 and 9 mm long, a pedicellaria can tilt in all directions." "Its various types of teeth catch algae and microscopic animals and clean and protect the sea urchin." "Around the sea urchin's mouth." "Some sea urchins have venomous glands and injection teeth." "Like the urchin itself each pedicel is covered by cilia that generate whirlpools." "Each cilia is less than .001 millimeter in length."