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

Onne van der Wal / Horned helmet (Cassis cornuta) and other seashells, corals and sponges, being cleaned by a man on the quayside ready for sale, St. Georges, Grenada, Caribbean.