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Xenophon, selection in mankind advocated by. Xenorhynchus, sexual difference in the colour of the eyes in. Xiphophorus Hellerii, peculiar anal fin of the male. Xylocopa, difference of the sexes in.
The male of the Cottus scorpius, or sea-scorpion, is slenderer and smaller than the female. There is also a great difference in colour between them. It is difficult, as Mr. Both sexes of the Labrus mixtus, although very different in colour, are beautiful; the male being orange with bright blue stripes, and the female bright red with some black spots on the back. Xiphophorus Hellerii.
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