Shell minute, nucleus with a small apex, the whorls later swollen, the second turn with three strong spiral threads, the following three whorls with 11 or 12 axial ribs with subequal interspaces and no pronounced shoulder; spiral sculpture between the sutures of three strong subequal flattish threads somewhat swollen when they override the ribs, and with a few much finer threads in the interspaces between the major threads; the spaces between the reticulation on the earlier whorls are deep and have a pitlike aspect; near the suture in fresh specimens is a dark spiral band extending to the rounded shoulder, in front of which the shell is yellowish-white with (on the last whorl) four or five narrow, brown, spiral lines with much wider interspaces; aperture moderately wide with a very shallow ill-defined sulcus, the outer lip thickened, smooth, the canal wide, not differentiated from the aperture, the inner lip smooth. Height of shell, 4.25; of last whorl, 2.7; diameter, 1.7 mm. (Dall.)

Type locality, off San Luis Obispo, California.
RANGE. Known only from type locality.