Keywords: Origin of Vertebrates Fig 026.png Fig 26 ”Transverse Section through the Brain of a Young Thelyphonus A supra-Å“sophageal ganglia; B infra-Å“sophageal ganglia; Al Å“sophagus 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Thelyphonus Invertebrate brain |