(Müller, 1784)
Description (shell):
The overall length of the internal shell is 15 mm. It is oval, cylindrical in form, thin, fragile, translucent white; the aperture is moderately wide open and it is shorter than the spire. Minute sculpture is present, consisting of spiral rows of oval dots, giving a chain-like appearance. These chains often project in a saw-tooth fashion along the anterior part of the shell's outer lip (P. scabra).
Animal:
Body up to 20 mm, white, sometimes with dark specks. Cephalic shield very long and narrow, indented anteriorly. Posterior part of body rendered elliptical by shell (P. scabra-drawing).
Habitat:
In sand and muddy sand, offshore. The diet of P. scabra is unknown, but it may itself be eaten by flatfish.
Distribution:
It has been reported from Iceland and from NW Europe (Norway to the Mediterranean Sea), West Africa and Madeira, to 1500 m (Distr. P. scabra).