. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 8 SEXUAL SELECTION. [Part II. onet, was considered by Linnaeus and by many subse- quent naturalists as a distinct species; it is of a dingy. Fig. 28.—Callionymns lyra. Upper figure, male; lower figure, female. reddish-brown, with the dorsal fin brown and the other fins white. The* sexes differ also in the proportional size of the head and mouth, and in the position of the eyes;11 but the most striking difference is the extraordina
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 8 SEXUAL SELECTION. [Part II. onet, was considered by Linnaeus and by many subse- quent naturalists as a distinct species; it is of a dingy. Fig. 28.—Callionymns lyra. Upper figure, male; lower figure, female. reddish-brown, with the dorsal fin brown and the other fins white. The* sexes differ also in the proportional size of the head and mouth, and in the position of the eyes;11 but the most striking difference is the extraordinary elon- gation in the male (Fig. 28) of the dorsal fin. The young males resemble, in structure and color, the adult females. Throughout the genus Callionymus,13 the male is gener- 11 I have drawn up this description from YarrelTs 'British Fishes,' vol. i. 1836, pp. 261, 266. 18 1 Catalogue of Acanth. Fishes in the British Museum,' by Dr. Giinther, 1861, pp. 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 Company
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