Another interesting beach find. What is it?
This is part of the home of a marine worm called Dioptra cuprea, sometimes known as a Plumed Worm. They are found on beaches from Massachusetts to the Gulf of Mexico, and related worms are found in many other parts of the world. These carnivorous worms secrete mucus to glue together sand, bits of shell, and other debris to make a tube that they live in. As beach sand shifts, the top of the tube can be broken away, letting people find these strong, flexible chains of shell bits.