retraction and protrusion, [498] f.

Polypide-bud, [468], [472], [487], [496], [499], [501], [510];

connected with reproduction, [507]

Polypostia, [19];

penes, [27]

Polystomatidae, [53], [55], [73]

Polystomatinae, [73]

Polystomum, [55], [57];

life-history, [58], [59]

Polyzoa, [465] f., [475];