Rissoa parva Brown falciform mark (comma) (1) on labial varix. Purple on three whorls of protoconch (2), not restricted to single most apical whorl. Six strong costae (3) visible on body whorl in apertural view. Columellar lip (4) reflected onto body whorl, no umbilical groove. H. 3 mm. Llŷn, March 2015.