The length of the shell varies between 50 mm and 410 mm. It is the largest of all helmet shells and is found on sand and coral rubble, often around reefs. This species occurs in the Red Sea, the Indian Ocean, off the southern African coast from northern KwaZulu-Natal and from Mozambique, as well as in the Pacific Ocean.

The shell of Cassis cornuta is a very popular collector’s item. In some places the snail is hunted for meat and is traditionally roasted in the shell over fire. Because of both of these factors, humans are a major enemy, and the species is now at risk in many places. However, worldwide, it is not listed in the Red List. Because this snail hunts the crown-of-thorns starfish, which feed on corals, Cassis cornuta has been put under strict protection in Queensland and Philippines.

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