Juergen Freund / Photograph and X-ray of shell of the Scotch Bonnet {Phalium granulatum} Note: the x-ray shows the shape of a hermit crab which has inhabited the shell's inner section.

Juergen Freund / X-ray of the shell of the Scotch Bonnet {Phalium granulatum} showing outline of Hermit crab which has inhabited the shells inner section.

Juergen Freund / Shell of the Scotch Bonnet {Phalium granulatum}

Juergen Freund / Bonnet (Helmet) snail shell {Phalium granulatum} Atlantic Ocean

Franco Banfi / Sea anemone (Calliactis parasitica) usually associated with hermit crabs, here on a Mediterranean bonnet shell (Semicassis granulata), Ponza island, Italy, Tyrrhenian Sea, Mediterranean.