Bittium reticulatum has small, lemon-shape aperture on right (dextral, 1). Operculum brown. Several weakly defined, spiral ridges with no tubercles on base of final whorl, (2). No siphonal canal, but short, flared, anterior sinus inclined to left (3) at base. Shell heights 2.9 mm and 6.2 mm. Llŷn Peninsula, North Wales. March 2016.