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.

Georgette Douwma / Helmet Shell (Cassis cornuta). Manado, North Sulawesi, Indonesia.

Juergen Freund / Horned helmet conch snail (Cassis cornuta) feeding on by sucking out a Sand dollar, Palawan, Philippines, Indo-pacific.

Doug Perrine / Horned helmet shell (Cassis cornuta) probes a Collector urchin or hawa e maoli (Tripneustes gratilla) and rises up to pounce on it, Honokohau, Kona, Big Island, Hawaii, Central Pacific Ocean

Constantinos Petrinos / Horned helmet snails {Cassis cornuta} Sulawesi, Indonesia

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

Juergen Freund / Red helmet snail shell {Cassis rufa} Philippines

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

David Fleetham / Horned helmet shell (Cassis cornuta), capturing a sea urchin to feed on, Hawaii.

Ingo Arndt / Horned Helmet (Cassis cornuta), Meeresmuseum Ozeania, Riedenburg, Germany, sequence 1 of 2