“Aristotle’s lantern” is seen in

Sea urchins (Except Echinocardium) possess an intricate mouth apparatus that's located on the underside of their bodies — it's referred to as an Aristotle's Lantern. This muscular system is comprised of a powerful set of jaws and five sharp teeth-like structures that can move in various directions.

Cucumaria and Synapta are sea cucumbers belongs to class holothuroidea.