Aurophore, [308]
Autodermin, [523]
Automatic processes, so-called, [12]
Autotrophic, [37]
Autozooids, [333]
Axial filament, of Heliozoan pseudopodia, [49], [71], [72], [74];
of Actinophrys sol, [71];
of Actinosphaerium eichornii, [72];
of Radiolaria Acantharia, [80]
Axial sinus, of Asterias rubens, [448];