Protrude, to thrust forward.
Protuberances, plaits higher or more elevated than the parts adjoining.
Punctuated, with small hollows like the punctures of a thimble.
Pyriform, pear-shaped.
Q.
Quadrangular, having four right angles.
Quadruplicated, having four plaits.
R.
Radiated, furnished with rays.
Radicated, is when the shell is fixed by the base to another body.