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| Keywords: Origin of Vertebrates Fig 167.png Fig 167 ”A Diagram of Section through a Trilobite-like Animal; B Diagram to illustrate the Suggested Formation of the Notochord from a Ventral Groove; C Diagram to illustrate the Suggested Formation of the Post-Branchial Gut by the continuation of the same process of Ventral Groove-Formation combined with Obliteration of Appendages and Growth of Pleural Folds; D Diagram to illustrate the Completion of the Vertebrate Type by the Meeting of the Pleural Folds in the Mid-Ventral Line with the Obliteration of the Atrial Cavity and the Conversion of the Ventral Groove into the closed Alimentary Canal Al alimentary canal; N nervous system; My myotome; Pl pleuron; App appendage; Neph nephrocĹ“le; Met metacĹ“le; Sd segmental duct; Mes mesonephros; At atrial chamber; Nc notochord; H heart; F fat body; Ng notochordal groove These diagrams are intended to complete the diagrams in Fig 160 which were purposely left incomplete 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Trilobita fossils | ||||
