Keywords: Origin of Vertebrates Fig 032.png Fig 32 ”Eye of Acilius Larva with its Optic Ganglion On the right side the nerve end-cells have been drawn free from pigment 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Retina Acilius Dytiscidae anatomy |