. 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. FISHES. 381 appendages which appear to be of no more use to him fox the ordinary purposes of life than are the tail feathers to the peacock. I am indebted for most of the following facts to the kindness of Dr. Giinther. There is reason to suspect that many tropical fishes differ sexually in color and structure; and there are some striking cases with our ]3ritish fishes. The male Callionymns lyra has been called
. 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. FISHES. 381 appendages which appear to be of no more use to him fox the ordinary purposes of life than are the tail feathers to the peacock. I am indebted for most of the following facts to the kindness of Dr. Giinther. There is reason to suspect that many tropical fishes differ sexually in color and structure; and there are some striking cases with our ]3ritish fishes. The male Callionymns lyra has been called the gemmeous dragonet " from its brilliant gem-like colors/^. Fig. 29. Callionymus lyra Upper figure, male ; lower figure, female. I N. B.—The lower figure is more reduced than the upper. When fresh caught from the sea the body is yellow of various shades, striped and spotted with vivid blue on the head; the dorsel fins are pale brown with dark longitudinal Ibands; the ventral, caudal and anal fins being bluish-black. The female, or sordid dragonet, was considered by Lin- naeus and by many subsequent naturalists as a distinct ppecies; it is of a dingy reddish-brown with the dorsal fin Ibrown and the other fins white. The sexes differ also in (the proportional size of the head and mouth and in the [oosition of the eyes;* but the most striking difference is I'/he extraordinary elongation in the male (fig. 29) of the *I have drawn up this description Irishes," vol. i. 1836. pp. 261. 26fi from YarrelFs *'British. 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
Size: 1847px × 1353px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear
