Sense of Hearing
Hearing is the perception of certain vibrations of bodies. These vibrations give rise to sound waves. These sound waves come to animals through the air, through water, or throught both air and water. Here we see the auditory organ of a mollusk showing the (a) auditory nerve, (b) the outer wall of connective tissue, (c) cells with auditory hairs, and (d) otolith.
Winchell, Alexander Sketches of Creation (New York, NY: Harper & Brothers, 1870)