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"Section of ray of Astropecten aurantiacus. a, vertebral ossicles; b, adambulacral ossicles; c, d, marginal ossicles; e, paxillae." — Encyclopedia Britannica, 1893

Astropectenn Aurantiacus

"Section of ray of Astropecten aurantiacus. a, vertebral ossicles; b, adambulacral ossicles; c, d, marginal…

Diagram to illustrate the action of the ossicles of the middle ear in the conduction of sound to the internal ear.

Ossicles of the Middle Ear

Diagram to illustrate the action of the ossicles of the middle ear in the conduction of sound to the…