Polyorchis, [278]

Polyphyes, [307]

Polyphyidae, [307]

Polypodium, [257]

Polyps, [245], [246];

alternation of generations in, [44], [250]

Polysiphonic, [276]

Polystomella, [59];

dimorphism and life-history of, [67] f.

Polythalamia (= Foraminifera with more than one chamber to shell), [64]