Astralium pileolum

Astralium pileolum, common name the cap trochis shell, is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.

Description
The size of the shell varies between 28 mm and 65 mm. The shell resembles the shell of Bellastraea squamifera (Iredale, 1924), with some differences. The shell is grayish white. The sculpture is obsolete above and nearly so below. The keel is very broad and thin.

Distribution
This marine species is endemic to Australia and occurs off the Northern Territory, Queensland and Western Australia.