Shell solid, white, smooth, with a short and sharply pointed spire of ten or eleven rounded whorls and widely expanded pointed varices; the last whorl forming more than half the length of the shell; nucleus glassy, thin, smooth; whorls closely adjacent, axis imperforate; spiral sculpture consisting of a single elevated thread passing from the posterior end of the aperture around the base; whorls smooth and shining, their surface overshadowed by the expanded varices, of which there are thirteen on the last whorl, which seem to be continuously joined to those of the preceding whorls; varices thin, broad, oblique, sharp, concave behind, extending directly outward from their attachment behind near the suture to a linguiform point, from which they round to the base of the aperture, and passing that are welded together in a semilunate twisted callus on the axial side of the aperture; the basal area would be well marked were not the varices continued over it in such a way as to screen it; the aperture is entire and almost circular, its margin even with the anterior plane of the varix, which, though polished, is irregularly lightly dimpled or malleated; interior white, polished. Lon. of shell, 8.3 mm; of last whorl, 4.4 mm; of last varix, 3.1 mm; of aperture, 2.5 mm; max. lat. of last whorl, 6.75 mm; of varix, aperture, and callus taken together, 4.75 mm; of aperture, 2.3 mm.

This very lovely species does not resemble closely any of those described in the monographs. The form of the varices recalls those of Hoplopteron. In its turbiniform shape it resembles S. pernobilis, the young of which, judging from the apex of the beautifully preserved Fish Commission specimen, have much more solid, hardly alate varices. It most resembles S. dianae Hinds, as figured by Reeve, but in this species, which comes from the Philippines, the alae are situated on a different part of the varix, and are of a distinctly different shape.
One would think the sharp close-set varices an excellent defence, but the specimen described has been drilled by a carnivorous gastropod.

Caribic. Off Barbados.