Shell small, fusiform, greenish-white, with about six whorls. First whorl of nucleus, flattish, minute, apparently smooth; second whorl with a sharp prominent shoulder-keel, crossed by numerous minute riblets, much lower than the keel. On the next whorl the periphery bears a keel like that at shoulder, and the riblets gradually become stronger, and fewer in number, diminishing, however, on the following whorls to mere axial striations; the peripheral keel also losing its prominence. On the later whorls, which still-preserve, though with less prominence, the keel at the shoulder, the spiral sculpture becomes predominant, and on the spire there are about four spiral threads between the shoulder and the suture in front of it and on the last whorl about ten between the shoulder and the beginning of the canal, which is also spirally striated. The prominent shoulder gives a turreted aspect to the whorls; the aperture being narrow; the outer lip sharp; the anal sulcus shallow and feeble; the pillar white, and attenuated in front; and the canal short and wide. The operculum ovate, somewhat concave with an apical nucleus. Height of shell, 8.5; of last whorl, 5.5; of aperture, 4 mm. (Dall.)

Canada. Barkley Sound, Vancouver Island.