. The descent of man, and selection in relation to sex. Evolution; Natural selection; Sexual selection in animals; Human beings -- Origin; Sexual dimorphism (Animals). Chap. XII.] FISHES. 11. Fig. 30.—Plecostomus barbatus. Upper figure, head of male; lower figure, 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 : D. Appleton and Co.

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Keywords: ., boo, bookcentury1800, bookdecade1870, booksubjectnaturalselection