Keywords: Origin of Vertebrates Fig 030.png Fig 30 ”Diagram of Formation of an Upright Compound Retina ABCD as in Fig 28 Op g I and Op g II two optic ganglia which combine to form the retinal ganglion Rt g 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Retina |