Posterior wreath, of Peritrichaceae, [138];

of Vorticella, [156], [157];

of Trichodina, [158]

Post-oral process, of ciliated band, of Bipinnaria and Ophiopluteus, [606];

of Echinopluteus, [607]

Potato, rest and germination of, [32]

Poteriodendron, [111]

Potts, [180]

Pouchet (the elder), on spontaneous generation, [43]

Pouchet, Georges, on Protozoa, [45]