Height 32% of length, typical for P. depressa. (In sample of twelve typical shells from S.W.England and N.W. Wales range 25-37%).
Posterior and anterior profiles slightly convex.
Grey cephalic tentacles
Small black eye is primitive (or degenerate) cavity, open to seawater and lined with black retina cells.
White sides of foot lack features such as epipodial tentacles.