“Shell dextral, depressedly pyramidal, thin, glassy, transparent sculpture smooth, with lines of growth; the periphery, the upper whorls, and the extended free portion of the last whorl are set with curved, white, glassy spines, the largest nearest to the aperture; each spine rises from a fine transverse rib, above and below the whorl, these nearly meeting, a gutter-like fold is produced which rises at right angles with the whorl; colour pale amber or sienna-brown, with a golden lustre; spire moderately high, conic, sides convex; apex rather sharp; suture impressed; whorls 5 to the constriction, whence it leaves the adjacent whorl, and turns sharply at right angles upwards in a diagonal direction to the apex of the shell, lying closely to the spire, reaching the apex it takes another sharp turn to the aperture, which thus rises high above and clear of the apex; aperture widely circular, trumpet-shaped; peristome continuous, thin, simple.”
-Godwin-Austen (1889) original descriptions –

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