THE RED-KNOBBED CURASSOW. 229 



specimen when first obtained exhibited but a very trifling 

 prominence of the cere above, and no appearance of its 

 projecting processes beneath. These, and more espe- 

 cially the latter, have since gradually increased to their 

 present size, giving, as they enlarged, to the bill at its 

 base the appearance of becoming continually thicker 

 and more substantial. Previously to their enlargement 

 there was little to distinguish the bird from the young 

 of the Globose Curassow, except the red colour of its 

 bill, which was then less intense than at present. One 

 of the Tower specimens, which is smaller than the rest, 

 and may be either still younger or perhaps a female, 

 has the under parts, which are white in the adult male, 

 of a light brown. 



Tliis bird appears to be nearly allied to that described 

 by M. Temminck under the name of Crax carunculata 

 from a single stufted specimen sent to Lisbon from Brazil. 

 In his figure of the head, however, the upper mandible 

 is deeper than in our specimen, and it entirely wants 

 the knob-like elevation. On the other hand the enlarge- 

 ment of the cere on either side beneath the lower man- 

 dible appears to be nearly similar ; but in the living 

 bird it bears no resemblance to a w^attle, and conse- 

 quently the name of " barbillon " assigned to this part, 

 and that of "carunculata" given to M. Temminck's 

 species, are totally inapplicable to ours. For this 

 reason we have given to the latter bird, which we must 

 consider as distinct, a new, an appropriate, and we 

 trust a permanent, name. Its propriety will be at once 

 recognised by those who are familiar with Mr. Yarrell's 

 extensive and valuable researches into the structure of 

 the organs of voice of birds in general, which have 

 embraced a striking example of this particular group. 



We believe that the fine specimen figured at the 

 liead of this article was brought to England and pre- 



