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Keywords from Image Description:
Origin of Vertebrates Fig . Fig Diagram of Sagittal Median Section through Eurypterus Larval Ammoctes Fullgrown Ammoctes All references in this work to Ammoctes or Petromyzon appear to refer to the European Brook Lamprey now called Lampetra planeri The Origin of Vertebrates org Walter Holbrook Gaskell PDoldauto Origin of Vertebrates