Acrodus nobilis, [584].

Acrogens, [60].

Actibatis, [753].

Actinia, [254].

Actinocrinites, [287], [294], [295].

Actinocrinus Parkinsoni, [294].

Agassiz, M., on cololites, [622].

Fishes, [563], [568], et passim.

Age of Reptiles, [644].