Keywords: Origin of Vertebrates Fig 158.png Fig 158 ”Section of Peripatus After Sedgwick Al alimentary canal; N nerve-cord; App appendage; i v internal and e v external vesicles of the segmented excretory tubule coxal gland 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Peripatus |