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The Descent of Man

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May 1870, p. 40.) From this statement, and more<br />

especially from the case <strong>of</strong> Ophidium, it is<br />

almost certain that in this, the lowest class <strong>of</strong><br />

the Vertebrata, as with so many insects and<br />

spiders, sound-producing instruments have, at<br />

least in some cases, been developed through<br />

sexual selection, as a means for bringing the<br />

sexes together.<br />

AMPHIBIANS.<br />

URODELA.<br />

[Fig. 32. Triton cristatus (half natural size, from<br />

Bell's 'British<br />

Reptiles').<br />

Upper figure, male during the breeding season;<br />

lower figure, female.]<br />

I will begin with the tailed amphibians. <strong>The</strong><br />

sexes <strong>of</strong> salamanders or newts <strong>of</strong>ten differ<br />

much both in colour and structure. In some

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