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ampullae animal groups animal kingdom anus basi-epithelial plexus bilateral bilateral symmetry Biol blastopore body skeleton body surface body wall brittle-stars burrow calcite canal system cavities chordates coelenterates connective tissue crinoids derms diagram to show echino echinoderm groups echinoderm skeleton Echinodermata echinoids enterocoel epithelial cells epithelial sensory cells feed five radii five-fold five-rayed fluid food to tissues fossil function glandular pedicellaria integument invertebrates jaw tip larva light mechanical stimulus madreporite metry microvilli molluscs motor nervous system neurons number of plates nutrients orientated fibres ossicle Oxford Biology Readers pathways pattern Each suture Penhaemal phyla phylum physiological pressure probably radial cleavage Radial nerve radius Redrawn alter Schematic diagram sea-urchin sensory endings Sensory hillock shown in Fig single crystal skeletal struts skeletally supported soluble starfishes substances superficial Suture lines confluent symmetry tube tube-feet Fig tube-foot activity type of pedicellaria upwardly directed mouth valves water-vascular sWem water-vascular system worms e.g.