. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. FiG. 30.—Xiphophorus Hellerii. Upper figure, male; lower figure, female. out the genus Gallionymus/'* the male is generally much more brightly spotted than the female, and in several species, not only the dorsal, but the anal fin is much elongated in the males. The male of the Coitus scorpius, or sea-scorpion, is slen- derer and smaller than the female. There is also a great dif- ference in color between them. It is difficult, as Mr. Lloyd ^^ remarks, ''for anyone who has not seen this
. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. FiG. 30.—Xiphophorus Hellerii. Upper figure, male; lower figure, female. out the genus Gallionymus/'* the male is generally much more brightly spotted than the female, and in several species, not only the dorsal, but the anal fin is much elongated in the males. The male of the Coitus scorpius, or sea-scorpion, is slen- derer and smaller than the female. There is also a great dif- ference in color between them. It is difficult, as Mr. Lloyd ^^ remarks, ''for anyone who has not seen this fish during the spawning-season, when its hues are brightest, to conceive the admixture of brilliant colors with which it, in other respects so " I have drawn up this description from British Museum," by Dr. Giinther, 1861, pp. Yarrell's ''British Fishes," vol. i. 1836, pp. 138-151. .*6i and 266. ^^ "Game Birds of Sweden," etc., 1867 •' "Nature," July 1873, p. 264. p. 466. .?• •* Catalogue of Acanth, Fishes in the. 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 Hurst
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear
