Poison apparatus, [62]

Poison fangs, [55], [62]

Poison glands, [62]

Poisons, [66]

prester (Vipera), [235]

Proteroglypha, [4], [151]

Protozoa, [112]

pseudaspis (Vipera berus, var.), [236]

Pupil, [12]

Pythoninæ, [4]