Keywords: Origin of Vertebrates Fig 020.png Fig 20 ”Brain of AmmocĹ“tes A dorsal view; B lateral view; C ventral view C E R cerebral hemispheres; G H R right ganglion habenulæ; PN right pineal eye; CH<sub>2</sub> CH<sub>3</sub> choroid plexuses; I -XII cranial nerves; C P Conus post-commissuralis All references in this work to AmmocĹ“tes or Petromyzon appear to refer to the species 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 Fish brains Lampetra planeri |