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Keywords from Image Description:
Origin of Vertebrates Fig . Fig Diagram of three Branchial Segments of Ammoctes compared with three Branchial Segments after Transformation to show how the Branchial Appendages of Ammoctes form the Branchial Pouches of Petromyzon After Nestler In both figures the branchial cartilages br cart the branchial view br and the senseorgans