Diagnosis: Shell of moderate height; whorls shouldered and somewhat angled at periphery; base slightly flattened; sculpture of fine spiral lirae and growth-lines; umbilicus with angled, strongly pliculate margin. Densely patterned with broad zig-zag brown bands.
Description: Shell of moderate height (L/D = 0,65-0,77), conical to cyrtoconoid, spire prominent; whorls shouldered and angled at periphery, somewhat flat-sided between shoulder and periphery; shoulder horizontal on middle whorls, sloping at end of body whorl; periphery below mid-whorl; base slightly flattened; teleoconch of up to 5 whorls. Sculpture fine, comprising spiral lirae and prosocline growth-lines; first whorl with up to 6 fine lirae becoming obsolete on second and first part of third whorls, but reappearing toward end of third whorl; body whorl with numerous fine, generally close set, but somewhat unevenly spaced lirae; lirae weaker but usually still present on base; axial sculpture of fine collabral growth-lines. Umbilicus deep, relatively wide; margin angled and with close set, broad, fold-like pliculae; interior with ca 4 coarser spiral lirae. Aperture subcircular to roundly triangular; peristome incomplete; outer lip smooth; interior nacreous. Protoconch: Typically solarielline, diameter 420-500 µm.
Colour: Ground colour yellowish-white, adapical surface heavily mottled in shades of brown, often in broad zig-zag radial bands; base variously patterned in similar shades, again often in radial bands.
Dimensions: Holotype, length 5,3 mm, diameter 7,5 mm; largest specimen, length 7,6 mm, diameter 10,0 mm.

Two of the four lots identified by Barnard (19636) as I. agulhasensis belong to the present species. It is easily separated from the true agulhasensis by its umbilical pliculae. The PF station 'off Hood Point’ is erroneous and in fact represents a locality in the Durban area.

South-Africa:Known only from Zululand and Natal south to Amanzimtoti, 50-270 m (living specimens 150-270 m, sand).