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By this latter means the Trigla produces pure and long-drawn sounds which range over nearly an octave. But the most interesting case for us is that of two species of Ophidium, in which the males alone are provided with a sound-producing apparatus, consisting of small movable bones, with proper muscles, in connection with the swim bladder.
Onitis furcifer, processes of anterior femora of the male, and on the head and thorax of the female. Onthophagus. Onthophagus rangifer, sexual differences of; variations in the horns of the male. Ophidia, sexual differences of. Ophidium. Opossum, wide range of, in America. Optic nerve, atrophy of the, caused by destruction of the eye.
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