. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences. 424 THE DESCENT OF MAN, note. The liead-crest and necK-appendage are rudimentary in the female.* The vocal organs of various web-footed and wading birds are extraordinarily complex, and differ to a certain extent in the two sexes. In some cases the trachea is Pig. 40. The Umbrella-bird or Cephalopterus ornatus, male (from Brehm). like a French horn, and is deeply embedded in the sternum. In the wild
. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings; Sexual selection in animals; Sexual dimorphism (Animals); Sex differences. 424 THE DESCENT OF MAN, note. The liead-crest and necK-appendage are rudimentary in the female.* The vocal organs of various web-footed and wading birds are extraordinarily complex, and differ to a certain extent in the two sexes. In some cases the trachea is Pig. 40. The Umbrella-bird or Cephalopterus ornatus, male (from Brehm). like a French horn, and is deeply embedded in the sternum. In the wild swan {Cyg7ius ferus) it is more deeply embedded in the adult male than in the adult female or * Bates, **The Naturalist on tlie Amazons/' 1863, vol. ii, p. 284; Wallace, in ** Proc. Zool. Soc," 1850, p. 206. A new species, with a still larger neck ap])endage {G. peuduliger), hfts Ititely been (iis- ^vered, see ''Ibiij,*' vol. 1, p. 40^. 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 : A. L. Burt
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