Adult shell is a fairly tall, sharply pointed cone; width about 45% of height. Juveniles are more squat and taper more sharply; W/H about 55%.
Body-whorl convex. Spire-whorls have almost straight-sided profile on adult (1); slightly concave on juvenile (2).
Height 27.6 mm, Dorset, April 2012 and juvenile (at larger scale) height 5.6 mm, west Anglesey, Wales, May, 2016.