All these specimens have five whorls, including minute, apical, embryonic whorl. A: Rissoa parva, H. 2.5 mm, North Yorkshire; protoconch purplish (1), but not confined to single tiny apical embryonic whorl. B: P. inconspicua, H. 1.8 mm, Lyme Bay, Dorset; tiny purple apical spot (2) confined to single embryonic whorl. Leg. coll. J.M. Light. C & D: P. inconspicua, H. 2 mm, Llŷn Peninsula; purple apical spot missing (3) but present on some others at site. E: P. sarsii, H. 2.3 mm, Donegal, Ireland; no apical purple spot, but some may have lilac protoconch (4). Leg. coll. J.M. Light.