Archive image from page 39 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansel02darw Year: 1871 Fio. .32.âMcgalophrys TOontana. The two left-band flares, the male; the two right-hand figures, the female. ders, standing out one on each side of the head, near the corners of the mouth.' The croak of the male is thus rendered exceedingly powerful; while that of the female is only a slight groaning noise.' The vocal organs differ considerably in structure in the several genera of the family ; and their development in all cases may be attrib- uted to sex
Archive image from page 39 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansel02darw Year: 1871 Fio. .32.âMcgalophrys TOontana. The two left-band flares, the male; the two right-hand figures, the female. ders, standing out one on each side of the head, near the corners of the mouth.' The croak of the male is thus rendered exceedingly powerful; while that of the female is only a slight groaning noise.' The vocal organs differ considerably in structure in the several genera of the family ; and their development in all cases may be attrib- uted to sexual selection. Reptiles. Chelonia. âTortoises and turtles do not' offer well- marked sexual differences. In some species, the tail of â > .1. Hishop, in ' Toild's Cyclop, of An;it. and Thys.' vol. iv. p. 1503. « Bell, ibid. pp. 112-114.
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