Length, 8.6; diameter at aperture antero-posteriorly, 1.75; laterally, 1.9; diameter at apex, 0.7 mm. (Pilsbry and Sharp.)

Shell short, decidedly curved, the bend mainly in the posterior half, very rapidly enlarging, tapering regularly from the largest aperture to the apex; thin, bluish-white, a little translucent, more or less flecked with opaque white (by incipient surface decay), or with eroded spots. Glossy, with close, fine, distinct growth-striae, very obliquely passing around the tube, bending backward on the convex, forward on the concave side; in most specimens also showing faint, low traces of longitudinal cords on the convex side. Aperture somewhat wider than long, quite oblique, the peristome thin. Anal orifice circular, simple when perfect, but often with irregular, broken edge.

British Columbia to San Quentin Bay, Lower California.

TYPE in United States National Museum, No. 107700. Type locality, off Tillamook Harbor, Oregon, in 786 fathoms.
This is a new name for C. simplex Pilsbry and Sharp, 1897, not D. simplex Michelotti, 1861. It was described as Dentalium stearnsii, Pilsbry and Sharp.