Two barrelfish float serenly in the warm waters of the Carribean, and so forth. Earth's coat of liquid water, more than any other feature, separates this planet from the other rocky bodies of the Solar System. The shorelines are as rich in life as the adjacent sea. Numerous crustaceans and arthropods scuttle along the surf-blasted rocks and beaches, while ebergs and tubenoses ride the air currents above. An interesting sight one would find on the beach are colonycrabs (Civilicancer hawaiiensis), social crustaceans which build large tunnel systems underground. -Emile M.