Testa imperforata, turbinata, saturate lilacea; anfractus 6 (?), penult. et antepenult. sulcis spiralibus 3-4 sculpti, convexi, ultimus supra et infra obsolete sulcatus, infra suturam leviter impressus, ad peripheriam rotunde subangulatus, incrementi lineis tenuibus perobliquis striatus, infra medium lineis paucis concentricis saturatioribus pictus, circa regionem umbilici albus ; apertura obliqua, intus obsolete sulcata; columella incrassata, reflexa, appressa, alba, callo tenui labro juncta.
Diam. maj. 21, min. 18 mm. ; alt. 22 mm.

Sab.—Rio McClelland, Useless Bay.
In some respects this species approaches P. Syadesi of Rochebrune and Mabille, but the spire is more elevated, the penultimate whorl larger and more convex, and the colour different. The single specimen has the apex broken away so that the number of whorls is given only approximately. The antepenultimate whorl has around the lower part three distinct rounded spiral lirae which also extend on to the penultimate and gradually die out upon the last. The general tone of the shell is a deep lilac, but oblique streaks of a darker tint at irregular intervals are noticeable upon the body-whorl, the base of which exhibits some dark and light concentric zones, excepting around the umbilical region, which is white. The faint sulci within the aperture correspond with the almost obsolete external spiral lirae.