Imperium naturæ C. Linnaeus, 1758 - nature
   Mundus Plinius - physical world
     naturalia - natural bodies
       Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Vermes Linnaeus, 1758 - worms see Phylum Vermes (C. Linnaeus, 1758)
           Order Testacea Linnaeus, 1758
             Genus Bulla Linnaeus, 1758
               327 Bulla ovum Linnaeus, 1758
               328 Bulla volva Linnaeus, 1758
               329 Bulla spelta Linnaeus, 1758
               330 Bulla verrucosa Linnaeus, 1758
               331 Bulla gibbosa Linnaeus, 1758
               332 Bulla naucum Linnaeus, 1758
               333 Bulla hydatis Linnaeus, 1758
               334 Bulla ampulla Linnaeus, 1758
               335 Bulla lignaria Linnaeus, 1758
               336 Bulla physis Linnaeus, 1758
               337 Bulla amplustre Linnaeus, 1758
               338 Bulla pallida Linnaeus, 1758
               339 Bulla canaliculata Linnaeus, 1758
               340 Bulla fontinalis Linnaeus, 1758
               341 Bulla hypnorum Linnaeus, 1758
               341 "0" Bulla cypraea Linnaeus, 1758
               342 Bulla tornatilis Linnaeus, 1758
               343 Bulla achatina Linnaeus, 1758
               343 "*" Columella dentata