Pseudoniscus, [25], [249]

Pteraspis, [29], [30], [275], [326], [343], [344], [350]

Pterichthys, [29], [31], [239], [326], [351]

Pterygoid, pedicle of, [295]

Pterygotus, [25], [27], [56], [170], [191], [221], [235], [238], [249], [276]

Ptychodera, [494], [495]

Ramus branchialis profundus of facial nerve, [311]

Ra"ms communicans, [2], [3]

Raphe, [46]

Recapitulation, law of, [434], [456], [498]