Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "Lapideum Regnum" nom. inval. - mineral kingdom
           Class "Fossilia" nom. inval. - Lapides aggregati
             Order †"Petrificata" - fossils
               Genus †"Ichthyolithus" nom. inval. - fossil fishes
                 1 †"Ichthyolithus incertae vel certae, totalis vel part. speciei" nom. inval.
                 2 †"Ichthyolithus dentis carchariae" nom. inval.
                 3 †"Ichthyolithus ovorum" nom. inval.
                 4 †"Ichthyolithus ossis palatini" nom. inval.