Arnoglossus, [687]

Arripis, [663]

Arthrodira, [535] f., [149]

Arterial system, [329] f.

Artificial pearls, [167]

Ascelichthys, [698]

Ascidia, [72], [73];

structure, [39] f., [43], [45];

test, [40], [41];

body-wall, [42];