. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CHAP. Xll.) AMPHIBIANS. 307 teresting 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.'*^ The drum- ming of the Umbrinas in the European seas is said to be audi- ble from a depth of twenty fathoms; and the fishermen of Rochelle assert '^ that the males alone make the noise during the spawning time; and that it is possible,
. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CHAP. Xll.) AMPHIBIANS. 307 teresting 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.'*^ The drum- ming of the Umbrinas in the European seas is said to be audi- ble from a depth of twenty fathoms; and the fishermen of Rochelle assert '^ that the males alone make the noise during the spawning time; and that it is possible, by imitating it, to take them without ;'*^ From this statement, and more especially from the case of Ophidium, it is almost certain that in this, the lowest class of the Vertebrata, as with so many in- sects and spiders, sound-producing instruments have, at least in some cases, been developed through sexual selection, as a means for bringing the sexes together. AMPHIBIANS. Urodela.—I will begin with the tailed amphibians. The sexes of salamanders or newts often differ much both in color. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882. New York Hurst
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