Page:Descent of Man 1875.djvu/283

Rh body, and by the inequality being much greater in the male than in the female; and why, when they are of equal size, both are





often much larger in the male than in the female, is not known. As I hear from Mr. Bate, the chelæ are sometimes of such length and size that they cannot possibly be used for carrying food to the mouth. In the males of certain fresh-water prawns (Palæmon) the right leg is actually longer than the whole body. The great size of the one leg with its chelæ may aid the male in fighting with his rivals; but this will not account for their