Image of facing pages (p. 10-11) from The descent of man, and selection in relation to sex / by Charles Darwin. London : John Murray, 1871. Page 10 shows side view of two fish, showing differences between male and female. Page 11 depicts the head of two fish, the Plecostomus barbatus, one male and one female. The male fish has has bearded appearance.
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Exhibited: "Rewriting the book of nature"
Rewriting the book of nature and Is part of: Descent of man, and selection in relation to sex; See related catalog record: 60820030R