Figure 6 in The characters of Palaeozoic jawed vertebrates

Figure 6. External neurocranial anatomy in lateral view. A, Norselaspis, an osteostracan (after Janvier, 1981b). B, Macropetalichthys, a petalichthyid placoderm (after Stensiö, 1969; Young, 1980). C, Dicksonosteus, an arthrodire placoderm (after Goujet, 1984a). D, Cladodoides, a chondrichthyan (after Maisey, 2005). E, Mimpiscis, a crown osteichthyan and actinopterygian (after Gardiner, 1984b). Abbreviation: N.II, opening for the optic tract (second cranial nerve). Not drawn to scale.