A. aurita, [312]
Aureliania heterocera, [383]
Auricula, of Echinus esculentus, [526];
of Cidaridae, [531];
of Arbaciidae, [531];
of Echinarachnius parma, [546];
represented by radial pieces of calcareous ring of Holothuroidea, [566]
Auricularia, [607];