crystalline cone
From ZooTerms (Dictionary of Invertebrate Zoology)
crystalline cone also acone eye, pseudocone eye, eucone eye, exocone eye: (Arthropoda: Insecta) The hard, clear intracellular structure of the eucone eye, produced by Semper cells beneath the cornea and bordered laterally by the primary pigment cells; also known as vitreous body or crystalline body.
