Broad, angulated, mahogany, non-spiral operculum, nearly opaque as on old adult.
1: narrow band of thin, pale, outer layer extruded near-vertically from transverse groove at anterior of opercular disc; immediately bends towards posterior, covers and is attached to dark lower layer.
Right: thin outer layer has many fine, gently-curving growth lines increasing in length away from 2: nucleus on posterior (labial) edge.
Left: thick inner layer made of stack of six concentric (probably annual) plates (adventitious layers extruded from circles of glands on opercular disc) with 3: excentric nucleus and 4: rough surface where columellar muscle attaches. 5: posterior (labial) margin beyond muscle attachment (25% of total surface) covered by shiny varnish from transverse groove across posterior of opercular disc.