Shell long ovate-fusiform: opaque snow white in the intercostal spaces, otherwise of a chalcedonic white: with strong wide transverse ribs, about thirteen on each whorl, nearly in continuous lines from the summit to the last whorl, and becoming obsolete anteriorly; with one or two raised spiral lines at the base of each whorl and numerous well rounded revolving ridges on the anterior half of the last whorl: apex acute: spire with slightly convex outlines, long and regularly conic: whorls seven, slightly convex, with a moderately impressed suture: aperture nearly in the form of a labrum denticulate within; sinus rather wide and shallow near the upper end of the labrum: canal very short.
Mean divergence about 30°; length of spire .12 inch; total length .2 inch; breadth .07 inch,

Shell small, elongated, slender, white, with a smooth blunt inflated nucleus of a whorl and a half and about four and a half rather flat-sided subsequent whorls; suture distinct, not deep; axial sculpture of (on the penultimate whorl about 14) vertical rounded ribs, crossing the whorls on the spire, with subequal interspaces; on the last whorl fainter and obsolete beyond the periphery, the incremental lines faint; spiral sculpture confined to the canal, of fine close threads; aperture narrow, outer lip thin, with a slight thickening behind it, smooth inside; pillar nearly straight; canal well defined; axis minutely pervious. Length of shell, 8; of aperture 2.5; diameter, 2.5 mm. U. S. Nat. Mus. Cat. No. 108007. Off Fernandina, numerous.
This is quite close to C. verrilli Dall, and may prove identical; one specimen shows brownish obscure color marks, but these may be accidental.