Galeodea alcocki

Galeodea alcocki, common name : Alcock's false tun, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.

Description
The shell size varies between 50 mm and 115 mm

Distribution
This marine species occurs in the Bay of Bengal and off the Philippines and Papua New Guinea.