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Keywords from Image Description:
Origin of Vertebrates Fig . Fig Dorsal half of Headregion of Ammoctes Tr trabecul Pit pituitary space Inf infundibulum Ser median serrated flange of velar folds All references in this work to Ammoctes or Petromyzon appear to refer to the species now called Lampetra planeri The Origin of Vertebrates org Walter Holbrook Gaskell PDoldauto