Archive image from page 39 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele187302darw Year: 1873 Fig. 32.âMegalophrys montana. The two left-hand figures, 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 The vocal organs differ considerably in structure in the several genera of the family ; and their development in all cases may be attrib- uted
Archive image from page 39 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele187302darw Year: 1873 Fig. 32.âMegalophrys montana. The two left-hand figures, 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 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. â Chelonia.âTortoises and turtles do not offer well- marked sexual differences. In some species, the tail of 43 J. Bishop, in 'Todd's Cyclop, of Anat. and Phys.' vol. iv. p. 1503. Bell, ibid. pp. 112-114.
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