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Keywords: Origin of Vertebrates Fig 021.png Fig 21 ”A Method of Formation of the Vertebrate Spinal Cord from the Ventral Chain of Ganglia and the Intestine of an Arthropod represented in 1; B Method of Formation of the Vertebrate Medulla Oblongata from the Infra-Å“sophageal Ganglia and the Cephalic Stomach of an Arthropod 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Invertebrate brain |