A few unusual specimens come to mind. A friend has a green glass beer bottle with a slipper limpet (Crepidula fornicata) inside. The shell is about 2.5 inches (6.25 cm) in length and almost 2 inches (5 cm) in width. The bottle opening is about 3/4 of an inch (1.9 cm) in diameter. Apparently the larval limpet swam into the bottle and settled on the inner surface, then grew to maturity there, attached to the glass. The bottle must have served as its private greenhouse, growing algae to serve as its food. Then there was the "bivalve chain" I had a few years ago - a large Lima lima vulgaris, to which was attached a large Chama brassica, to which was attached a medium-size thorny oyster (Spondylus variegatus), to which was attached a medium-size cock's-comb oyster (Lopha cristagalli), to which was attached another, smaller, Chama brassica. The whole thing curved around into sort of a horseshoe shape. Too bad it didn't remain in the ocean long enough for some other bivalve to fill in the gap and make a complete ring! Xenophora (carrier shells) are always a good source of the unusual. You never know what they will attach to themselves. I have seen two specimens with land snails attached. One specimen attached a piece of wood about 2 inches in length, with a nail sticking through it. One had a bottle cap attached. One carrier attached an auger (Terebra) shell, the other end of which was attached to a large chunk of another carrier shell. But my favorite was the specimen with the built-in collection data. A Xenophora pallidula from the Philippines had attached a triangular piece of brown glass, with the single word "Philippines" printed across it in white. The source of this carrier costume component was later identified as a San Miguel Beer bottle. Regards, Paul M.