Keywords: Origin of Vertebrates Fig 082.png Fig 82 ”Diagrammatic Representation of the so-called Thyroid Gland of AmmocĹ“tes C central chamber; A A ˛ anterior extremity; B B ˛ posterior extremity; Th o thyroid opening into respiratory chamber; Ps br Ps br ˛ ciliated grooves Dohrn's pseudo-branchial grooves 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 |