Phalium flammiferum, the striped bonnet, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.
Shells of Phalium flammiferum can reach a size of 41-.[1] These moderately large shells are oval or globular, with a pointed spire and a smooth surface covered with longitudinal brown to pale brown stripes. Outer lip is denticulate, with large brown bands. The aperture is dark brown.[2]
This species has an Indo-Pacific distribution. It can be found from Japan to Vietnam and in Northern China Seas.[3] It prefers fine sandy substratum at depths of 10 to 50 m.[2]