Walcott classified a ring-like fossil he called Peytoia as a kind of jellyfish, and another poorly preserved fossil he called Laggania as a holothurian (sea cucumber).[41] After many plot twists, Derek Briggs started dissecting another ill-defined fossil in very thin slices and found a pair of Anomalocaris-like structures on one end of a specimen of Laggania, which also had a specimen of Peytoia attached just behind those of Anomalocaris.