« Shell compressed, glossy, white, with three volutions destitute of striae; apex depressed, scarcely elevated above the other whirls; aperture orbicular, slightly adhering to the body, and turning considerably downwards, forming a large and deep umbilicus; the under part shews the volutions more round and distinct than any other British species of marine testacea we are acquainted with. » – G. Montagu: Supplement to Testacea Britannica, Exteter 1808, p.147. Protoconch smooth; last whorl devoid of spiral sculpture on its upper part.

This species differs from serpuloides by its aperture, which is straight on the columellar side, and by the spiral sculpture, made of flat ribs that progressively disappear on the apical part of the whorls, and remain only on the base. – 6m deep, in coralline algae, Maerl beds around Black Rock, southern extremity of the Carrick Roads, Falmouth, SW. Cornwall, Northwestern English Channel. 1,1mm.