The corneal cones of Limulus as optimised light concentrators.
D000818:Animals; D001097:Arachnida / Q000502:physiology*; D003315:Cornea / Q000502:physiology; D008027:Light; D008857:Microscopy, Interference; D010786:Photoreceptor Cells / Q000502:physiology* / Q000648:ultrastructure