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The Descent of Man

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ell, in 'Proc. Zoolog. Soc.' 1869, p. 138. See also<br />

an interesting paper by Lieut. Johnstone, in<br />

'Proceedings, Asiatic Society <strong>of</strong> Bengal,' May<br />

1868.) <strong>The</strong> sexes <strong>of</strong> other pachydermatous animals<br />

differ very little or not at all, and, as far as<br />

known, they are not polygamists. Nor have I<br />

heard <strong>of</strong> any species in the Orders <strong>of</strong> Cheiroptera,<br />

Edentata, Insectivora and Rodents being<br />

polygamous, excepting that amongst the Rodents,<br />

the common rat, according to some ratcatchers,<br />

lives with several females. Nevertheless<br />

the two sexes <strong>of</strong> some sloths (Edentata)<br />

differ in the character and colour <strong>of</strong> certain patches<br />

<strong>of</strong> hair on their shoulders. (13. Dr. Gray, in<br />

'Annals and Magazine <strong>of</strong> Natural History,'<br />

1871, p. 302.) And many kinds <strong>of</strong> bats (Cheiroptera)<br />

present well-marked sexual differences,<br />

chiefly in the males possessing odoriferous<br />

glands and pouches, and by their being <strong>of</strong> a<br />

lighter colour. (14. See Dr. Dobson's excellent<br />

paper in 'Proceedings <strong>of</strong> the Zoological Society,'<br />

1873, p. 241.) In the great order <strong>of</strong> Rodents, as

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