Height 4mm. From salting pool, salinity 22.7 p.p.t., Aust, Severn Estuary. Most specimens from this site with sulphide-rich anaerobic mud had extensive black encrustation. Aug. 2011.
Acute adapical angle (at top of aperture). Shallow sutures and flat whorls. Black of opercular lobe visible through part of translucent operculum.