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Keywords from Image Description:
Origin of Vertebrates Fig . Fig Cartilage of Trabecul of Ammoctes stained with Hmatoxylin and Picric Acid Nests of Cartilage Cells in Entosternite of Hypoctonus stained with Hmatoxylin and Picric Acid All references in this work to Ammoctes or Petromyzon appear to refer to the species now called Lampetra planeri The Origin of Vertebrates