5 whorls; sculpture strongly cancellate; first whorl initially sculptured only with widely spaced, rib-like, axial pliculae (ca 15), but 3 spiral cords develop soon thereafter, one forming shoulder, another level with the abapical
suture and the third between these at whorl periphery; cords persist and become progressively stronger with growth; an additional (fourth) subsutural cord may or may not develop on the shoulder during the last or penultimate whorl; no intermediary spiral cords; intervals between cords wider than cords themselves; last adult whorl with 20-30 axial pliculae; pliculae narrower than cords and somewhat lamellate, sometimes raised into squamose nodules where they cross cords; interstices obliquely quadrate.
5-2 times as numerous as peripheral projections; interval between peripheral cord/keel and abapical
suture progressively deeper and more channelled with growth; development of remaining spirals between adapical suture and periphery variable, sometimes distinct, sometimes obsolete; axial sculpture becoming less obvious with growth; apical whorls (not first) somewhat cancellate, becoming more foveolate with elongate D-shaped pits on later whorls; pliculae in supra-sutural sulcus usually stronger and less close-set than those above peripheral keel.
1 mm, initially somewhat smooth, but with distinct axial riblets developing along adapical suture during first whorl, these extending to abapical
suture on second whorl (Fig.