19 Peringia ulvae

19 Peringia ulvae

Sickle-shaped curved yellow and white penis (1) behind head. Single, small, pallial tentacle (2) extending from shell-aperture. Eye on anterior of pinkish white patch (3).
Males. Shell heights 4.5 mm. From large muddy salting pool on upper Dee Estuary, Flintshire, salinity 29 p.p.t. (variable). September 2011.