220 



THE IVORY-BILLED WOODPECKER. 



Fig. 1. 



tip; the space between the ridges concave, the margins overlapping and _ 

 obtuse; the tip wedge-shaped and truncate. The lower mandible, b, has the 

 angle of moderate length and width, the dorsal line ascending and very 

 slightly convex, the ridge narrow, with a broad groove on each side, beyond 

 which the sides become erect and convex, the edges very broad, for two- 

 thirds of their length roundish, afterwards flattened, the tip wedged-shaped 

 and abrupt. The gap-line is almost straight. 



The roof of the mouth is somewhat convex: there are upon it two longi- 

 tudinal papillate ridges, meeting anteriorly to the palatal slit, whence to the 

 tip is a median groove, at the anterior extremity of which is a small hole; 

 the upper mandible is but slightly concave. The posterior aperture of the 

 nares is oblongo-linear, margined with acute papillae, the space between it 

 and the ridges also papillate. 



The nostrils are oblong, 3 

 twelfths in length, \\ twelfths in 

 height, entirely covered by the 

 bristly reversed feathers. The 

 aperture of the eye is 4^ twelfths 

 in width. That of the ear hori- 

 zontally oblong, 35 twelfths in 

 length, and 2 twelfths in height. 



The heart is of moderate size, 

 broadly conical, 1 inch 2 twelfths 

 long, 1 inch 1 twelfth in breadth 

 at the base. The liver is very 

 small, the right lobe much larger 

 than the left, the former being 1 1 

 twelfths long and 1 inch broad, 

 while the latter is 10 1 - twelfths 

 long and 7 twelfths in breadth. 

 There is no gall-bladder. 



The oesophagus, a b c, is 6£ 

 inches long, and of the nearly uni- 

 form width of 6 twelfths. On en- 

 tering the thorax, at a, it curves 

 considerably to the left side, and 

 becomes very muscular; the pro- 

 ventriculus, b c, has a breadth of 

 1\ twelfths. The stomach, c d, 

 is of moderate size, of a broadly 



