Filopodia, [47] n.

Filosa, [29], [50], [52] f.;

resemblance to Allogromidiaceae, [59]

Finger, [580];

of Cystoidea, [597];

of Blastoidea, [599], [600]

Firestone of Delitzet contains fossil Peridinium, [132]

Fischer, on fixing reagents, [11];

on structure of flagellum, [114]

Fish, rheotaxy of, [21];