Scientists call a sea urchin's mouth Aristotle's Lantern. The name comes from the Greek philosopher and scientist Aristotle who described a sea urchin's mouth in his book, "History of Animals." Specifically, he described a sea urchin's mouth as looking like a horn lantern, only with its panes removed. However, that later proved to be a mistranslation of Aristotle's writings, as explained by British scholar D'Arcy Thompson. Modern scholars now realize that Aristotle never actually meant to describe the sea urchin's mouth in that passage. Instead, Aristotle actually described the whole sea urchin, which resembled the lamps used in Greece at the time. That said, the term "Aristotle's Lantern," still remains in use among scientists to refer to a sea urchin's mouth.