. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. 332 THE DESCENT OF MAN. not know of a single instance in which the aale is actually larger than the female. With some Cyprinodonts the male is not even half as large. As in many kinds of fishes the males habitually fight together, it is surprising that they have not gen- erally become larger and stronger than the females through the effects of sexual selection. The males suffer from their small size, for according to M. Carbonnier, they are liable to be de- voured by the females of th
. The descent of man : and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings. 332 THE DESCENT OF MAN. not know of a single instance in which the aale is actually larger than the female. With some Cyprinodonts the male is not even half as large. As in many kinds of fishes the males habitually fight together, it is surprising that they have not gen- erally become larger and stronger than the females through the effects of sexual selection. The males suffer from their small size, for according to M. Carbonnier, they are liable to be de- voured by the females of their own species when Fig. 29. Callionymus lyra. Upper figure, male; lower figure, female. N. B. The lower figure is more reduced than the upper. and no doubt by other species^ Increased size must be in some manner of more importance to the females, than strength and size are to the males for fighting with other males; and this perhaps is to allow of the production of a vast number of ova. In many species the male alone is ornamented with bright colors; or these are much brighter in the male than the female. The male, also, is sometimes provided with appendages which ap- pear to be of no more use to him for 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. Gunther. There is reason to suspect that many tropical fishes differ sexually in color and structure; and there are some striking cases with our British fishes. The male Callionymus lyra has been called. 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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