Pentremites, [599]

Pepsin, [16]

Peptic, digestion, [16];

juice in Carchesium, [147]

Peptones, [15]

Perforate, Corals, [371];

Foraminifera, [58] f.

Peribolaster, [453], [463]

Peribranchial spaces of Asterias rubens, [449]

Pericolpa, [322]