Original: Some species of coral-reef sea cucumbers within the order Aspidochirotida can defend themselves by expelling their sticky cuvierian tubules (enlargements of the respiratory tree that float freely in the coelom) to entangle potential predators.
Simplified: Some species of coral reef sea cucumbers defend themselves by expelling sticky cuvierian tubules to entangle potential predators. These tubules are attached to the respiratory tree in the gut.