. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. VOCAL MUSIC. 369 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 convoluted, like a French horn, and is deeply embedded in the sternum. In the wild swan. Fig-. 40. The Umbrella-bird or Cephalopterus ornatus (male, from Brehm). (Cygnus ferus) it is more deeply embedded in the adult male, than in the adult female or young male. In the male Merganser the enlarged portion of
. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. VOCAL MUSIC. 369 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 convoluted, like a French horn, and is deeply embedded in the sternum. In the wild swan. Fig-. 40. The Umbrella-bird or Cephalopterus ornatus (male, from Brehm). (Cygnus ferus) it is more deeply embedded in the adult male, than in the adult female or young male. In the male Merganser the enlarged portion of the trachea is furnished with an additional pair of muscles.^ In one of the ducks, however, namely Anas punctata, the bony enlargement is only a little more developed in the male than in the female.^^ But the meaning of these dif- ferences in the trachea of the two sexes of the Anatidae is not lace, in 'Proc. Zool. Soc' 1850, p. 206. A new species, with a still larger neck-appendag-e (C. pendulig-er), has lately been discovered, siee 'Ibis,' vol. i. p. 457. *-5 Bishop, in Todd's Cyclop, of Anat. and Phys.' vol. iv. p. 1499. *» Prof. Newton, 'Proc. Zoolog. Soc' 1871, p. 651 25. 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 : Merrill and Baker
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