Cantharidus capillaceus capillaceus is a subspecies of sea snail, a marine gastropod mollusc in the family Trochidae, the top snails.
Coloration of the apex is pink, and the remainder of the shell is leaden-purple. The columella is white, and the aperture is reddish iridescent within, the peristome narrowly edged with pink.
The shell height is up to 28 mm, and the width is up to 19.5 mm.