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Keywords: Origin of Vertebrates Fig 083.png Fig 83 ”Thyroid Gland of AmmocĹ“tes as it would appear if the Central Chamber were Uncurled and the Two Horns B B ˛ separated from the Central Chamber All references in this work to AmmocĹ“tes or Petromyzon appear to refer to the European Brook Lamprey now called Lampetra planeri 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Lampetra planeri |