Keywords: Origin of Vertebrates Fig 001.png Fig 1 ”Arrangement of Organs in the Vertebrate A and Arthropod B Al gut; H heart; C N S central nervous system; V ventral side; D dorsal side 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book |