Keywords: Origin of Vertebrates Fig 078.png Fig 78 ”Eurypterus The segments and appendages on the right are numbered in correspondence with the cranial system of lateral nerve-roots as found in vertebrates M metastoma The surface ornamentation is represented on the first segment posterior to the branchial segments The opercular appendage is marked out by dots 1908 The Origin of Vertebrates https //archive org/details/originofvertebra1908gask Walter Holbrook Gaskell PD-old-auto-1923 1914 Origin of Vertebrates book Eurypterus |