484 



THE DESCENT OF MAN 



{Gephalopterus ornaius, Fig. 40) is called the umbrella-bird, 

 from its immense topknot, formed of bare wbite quills 

 surmounted by dark- blue plumes, whicli it can elevate into 

 a great dome no less tlian five inches in diameter, covering 



Fia. 40.— The Umbrella-bird or Cephalopterus ornatus (male, from Brebm). 



the whole head. This bird has on its neck a long, thin, 

 cylindrical fleshy appendage, which is thickly clothed with 

 scale-like blue feathers. It probably serves in part as an 

 ornament, but likewise as a resounding apparatus; for Mr. 



Newton, in the "Ibis," 1862, p. lOT; Dr. CuUen, ibid., 1865, p. 145; Mr. 

 Flower, in "Proc. Zool. Soc," 1865, p. HI; and Dr. Murie, in "Proc. Zool. 

 Soc," 1868, p. 471. In this latter paper an excellent figure is given of the 

 male Australian Bustard in full display with the sac distended. It is a sin- 

 gular fact that the sac is not developed in aU the males of the same species. 



