Ann"lids, parapodal ganglia, [283]

Ann"lids, phagocytic glands, [421]

Anthozoa, [474]

Antiarcha, [29], [326], [343]

Antibody, [492]

Antitoxin, [492]

Anus, [43], [457]

Aponeuroses, [327], [342], [414]

Apparatus, auditory, [355]

Appa"rtus, dioptric, [83]