Alex Mustard / Grey bonnet snail (Phalium glaucum) female laying a large mass of orange eggs. This egg mass has been laid by several snails. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Georgette Douwma / Grey bonnet snail (Phalium glaucum). Ambon, Indonesia.

Georgette Douwma / Helmet shell (Cassis cornuta) on seabed Lembeh Strait, Sulawesi, Indonesia.

Juergen Freund / Bonnet snail (Phalium sp) Lembeh Strait, North Sulawesi, Indonesia.

GEORGETTE DOUWMA / Red emperor fish / snapper (Lutjanus sebae) feeding on a Grey bonnet (Phalium glaucum). Lembeh Strait, North Sulawesi, Indonesia.

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

GEORGETTE DOUWMA / Grey bonnet / Helmet shell (Phalium glaucum). Lembeh Strait, North Sulawesi, Indonesia

David Fleetham / Close-up of Horned helmet shell (Cassis cornuta) hunting Red Pencil Urchin (Heterocentrotus mamillatus), Hawaii, USA, Pacific Ocean.

David Fleetham / Horned helmet (Cassis cornuta) on the seabed, with eyes and antenna stalks cautiously peering out the front of its shell, Hawaii, Pacific Ocean.