Pulsatile vacuole, [14];

= Contractile vacuole, q.v.

Pulsellum, [18], [114]

Punjab, dourine disease in, [119]

Pupa, of Holothuroidea, [615]

Pure cultures, [43]

Putrefaction, organisms of, [42] f., [116] f.

Pycnolithus, [346]

Pycnopodia, [453], [474]

Pygaster, [558], [559]