Keywords: Origin of Vertebrates Fig 085.png Fig 85 ”Facial Segment of AmmocĹ“tes marked out by Shading VII 1 thyroid part of segment; VII 2 hyoid or branchial part; 3-9 succeeding branchial segments belonging to IXth and Xth nerves; V the velar folds; Ps br Dohrn's pseudo-branchial groove; Th o thyroid opening; C curled portion of thyroid 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 |