Llŷn, North Wales. March 2016. L. cancellatus. Length 8.6 mm when live. Maximum length 9 mm.
Eight overlapping, thin, fragile, white or cream valves stained with black manganese and rust coloured ferrous deposits.
1: No lateral insertion plates or slits.
2: Tegmentum layer eroded from central area of head valve on this old specimen, exposing underlying ungranulated articulamentum layer.
Articulamentum projects beyond tegmentum as apophyses to underlie next valve, triangular on intermediate valves (3), but rounded trapezoidal on tail valve viii (4).
Llŷn, North Wales. March 2016.