Pavonia (Fungiidae, [403]), [390]

Paxilla, [455];

evolution of, [466];

relation to granules of Valvata, [471]

Paxillosa, [461], [466] f.;

restriction of papulae to dorsal surface, [469]

Peachia, [366], [380];

P. hastata, [370]

Pébrine, [107]

Pectinate pedicellariae, [456], [466]