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Aristotle's lantern in a sea urchin, viewed in lateral section. The mouth of most sea urchins is made up of five calcium carbonate teeth or plates, with a fleshy, tongue-like structure within. The entire chewing organ is known as Aristotle's lantern from Aristotle's description in his History of Animals (translated by D'Arcy Thompson):
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Aristotle’s lantern is a complex system of jaws and muscles which are capable of a variety of feeding types including suspension feeding, herbivory and detritivory feeding, and occasionally predation. Adaptations to this lantern have allowed sand dollars to live in habitats which have fine, shifting substrates.
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Page one of Aristotle's On the Heavens, from an edition published in 1837. On the Heavens (Greek: Περὶ οὐρανοῦ; Latin: De Caelo or De Caelo et Mundo) is Aristotle's chief cosmological treatise: written in 350 BCE, [1] it contains his astronomical theory and his ideas on the concrete workings of the terrestrial world.
Many of Aristotle's works are extremely compressed, and many scholars believe that in their current form, they are likely lecture notes. [2] Subsequent to the arrangement of Aristotle's works by Andronicus of Rhodes in the first century BC, a number of his treatises were referred to as the writings "after ("meta") the Physics" [b], the origin of the current title for the collection Metaphysics.
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The Isagoge (Greek: Εἰσαγωγή, Eisagōgḗ; / ˈ aɪ s ə ɡ oʊ dʒ iː /) or "Introduction" to Aristotle's "Categories", written by Porphyry in Greek and translated into Latin by Boethius, was the standard textbook on logic for at least a millennium after his death.