The exterior surface has about 35 radial ridges crossed by about 20 less prominent, narrower, concentric ridges which are most distinct where they cross the spaces between the radial ridges, and form small tubercles where they cross the radial ridges. The intersecting ridges form a reticulated pattern.
The anterior of the shell has a marginal slit with a recessed slit-band of shell material filling the slit on earlier growth stages.
Left: L. 5.8 mm, W. 4.6 mm, H. 3.2 mm, W/L 79%, Menai Strait, Wales, March 2015.
Right: L. 8.1 mm, W. 5.1 mm, H. 3.89 mm, W/L 63%, Dubrovnik, Croatia, 350 m depth. Coll. J. Prkić. :copyright: R. Stanić.
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