Pinnated, winged.
Plaited, folded.
Plaits, folds.
Plicated, folded or plaited, as in the pillar of the volute tribe.
Plumose, having a feathery appearance.
Polythalmous, divided into several chambers.
Porcate, marked with raised longitudinal lines.
Porrected, projecting.
Prismatic, generally applied to the colours of shells, being like those of the prism; iridescent.
Produced, lengthened out.