Keywords: Origin of Vertebrates Fig 031.jpg Fig 31 ”One of a Series of Horizontal Sections through the Head of AmmocĹ“tes l m upper lip muscles; m c muco-cartilage; n nose; na c nasal cartilage; pn right pineal eye and nerve; g h r right ganglion habenulæ; s m somatic muscles; cr membranous wall of cranium; ch choroid plexus; gl glandular substance and pigment filling up brain-case 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/ost-biology-the_origin_of_vertebrates Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Lampetra planeri |