Foetopterus ambiguus, fossil, [181]
Foot, [9]
Foramen, [9];
for optic nerve, [11];
for trigeminal, [11]
Forbes, H. O., on Frigate Bird, [82] n.;
on Phalacrocorax, [77] n.
Forbes, W. A., on classification, [14];
on Barbets and Toucans, [448];
on classification of Petrels, [59] n.;