of Rotifera, [207], [212];

of Gastrotricha, [234];

of Polychaeta, [296];

of Earthworms, [359];

of Leeches, [393], [406] f.;

of Gephyrea, [422], [443];

of Polyzoa, [467]

Foot, in Rotifers, [200], [201]

Foraminifera, as food of Polychaeta, [296]

Forceps, of Eunice, [270]