The inner and outer lips of the aperture develop teeth with age.
The ear-shaped operculum has a narrow ‘ear lobe’ fitting into the siphonal canal (1). Its columellar (2) and parietal edge (3) is relatively smoothly curved. The palatal edge (4) is more ragged with a large indent at the base (5). The operculum has a blackish blotch (6) on the area of attachment to the opercular disc. There is a medial black line (7) on the opercular disc along the edge of the attachment area, which is visible through the operculum on live specimens.
H. 10.5 mm, Portland, Dorset, England, April 2012.
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