Archive image from page 391 of The descent of man . The descent of man : and selection in relation to sex descentofmanseledarw Year: 1874 378 THE DESCENT OF MAN. ored more conspicuously in the niale than in the female; and 'the 'oblique grooves upon the sides of the lower mandible are pe- 'culiar to the male sex.'' Fig. 46. Bower-bird, Chlamydera maculata, with bower (from Brehm). i The head, again, often supports fleshy appendages, filaments, and solid protuberances. These, if not common to both sexes, are always confined to the males. The solid protuberances have been described in detail
Archive image from page 391 of The descent of man . The descent of man : and selection in relation to sex descentofmanseledarw Year: 1874 378 THE DESCENT OF MAN. ored more conspicuously in the niale than in the female; and 'the 'oblique grooves upon the sides of the lower mandible are pe- 'culiar to the male sex.'' Fig. 46. Bower-bird, Chlamydera maculata, with bower (from Brehm). i The head, again, often supports fleshy appendages, filaments, and solid protuberances. These, if not common to both sexes, are always confined to the males. The solid protuberances have been described in detail by Dr. W. Marshall,'' who shows that they are formed either of cancellated bone coated with skin, or of dermal and other tissues. With mammals true horns are always supported on the frontal bones, but with birds various bones have been modified for this purpose; and in species of the 8 'Land and Water,' 1868, p. 217. «•'' Ueber die Schadelhocker,' &c., 'Niederlandischen Archjv fur Zoo- logie,' B. I. Heft, 2, 1872.
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