Keywords: Origin of Vertebrates Fig 035.png Fig 35 ”Eye of Acilius Larvæ After Patten l chitinous lens; c corneagen; pr pre-retinal layer; rh rhabdites; ret retinal end-cells 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Acilius Insect eyes Dytiscidae anatomy |