National Geographic : 1949 Jul
Shells Take You Over World Horizons National Geographic Photographer Justin Locke Big Enough for a Child's Bathtub Is Half a Giant Clam Shell The little visitor to the Smithsonian Institution is sitting in a 150-pound valve of Tridacna gigas from the coral reefs of the South Pacific (opposite page). T. C. noughlcy Shell of the Bailer Shellfish Is Big as a Football, Its Muscular Foot Even Larger Common on the Great Barrier Reef, Cynbium diadema resembles a watermelon in shape and pattern. The shell is cream or ochreous yellow outside, rich apricot inside. Often as long as 16 inches, it is invaluable to the natives as basket, saucepan, drinking vessel, and canoe bailer. The muscular foot, too big to draw inside, may double the creature's length when fully extended, and weigh several pounds.