The Collaborative International Dictionary of English v.0.48:

Cranioscopist \Cra`ni*os"co*pist\ (kr?`n?-?s"k?-p?st), n.
   One skilled in, or who practices, cranioscopy.
   [1913 Webster]

         It was found of equal dimension in a literary man whose
         skull puzzied the cranioscopists.        --Coleridge.
   [1913 Webster]