Otoliths, [378]

Ovum, [473]

Pacinian bodies, [470], [477]

Palæmon, [20], [422]

Palæontology, evidence of, [20], [497]

Palæostoma, [317]

Palæostraca, [27], [396]

Palæo"traca, median eyes, [74]

Palæo"traca, mesosomatic appendages, [188]

Palæo"traca, olfactory organs, [221]