Acantharia (Actipylaea), [76], [78], [78], [80];

myophrisks in, [80];

Zooxanthella in, [80];

reproduction of, [86] n.;

skeleton of, [82]

Acanthaster, [458], [462]

Acanthin, [71] n., [75], [76]

Acanthocephala, nutrition of, [38]

Acanthoconia barrandei, [207], [207]

Acanthocystis, [71];