Murex cailletti Petit, 1856 Siratus cailletti, common name Caillet's murex, is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

with about half that length being the species' rather long siphonal canal.

A rare 'two-tailed' specimen of Siratus cailletti This oddity occurs when the siphonal canal associated with the previous varix fails to break away.

This species occurs in the Caribbean Sea, the Gulf of Mexico and the Lesser Antilles; along the Bahamas.

At Barbados this species has been trapped alive, in abundance, at depths from 450 – 550 ft. offshore the island's West coast.