Flosculariidae, [201], [203], [205], [220] n., [221], [230]
Flukes, [51]
Flustra, [465], [466], [467], [472], [473], [477], [515], [518], [526];
avicularia, [482]
Flustrella, [467], [477], [518], [532];
larva, [513]
Flustrina, [518]
Food, of Turbellaria, [4];
of Leptoplana, [10];
of Polyclads, [24];