Keywords: Origin of Vertebrates Fig 094.png Fig 94 ”Dorsal View of Brain and Camerostome of Galeodes cam camerostome; pr ent pre-oral entosclerite; l l dependent portion of camerostome; ph pharynx; al alimentary canal; n op median optic nerves; pl plastron; v c ventral nerve chain; 2 3 second and third appendages 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Galeodes Invertebrate brain Arachnida anatomy |