Figure 2.— Dorsal aspect of the same specimen shown in Figure i ; b, capital apte- 

 rium ; c, the median (at the point indicated) elevation of the skin caused by the epi- 

 branc'hials of the hyoidean apparatus beneath it ; g, spinal tract ; / inner humeral tract ; 

 h, lower dilation of spinal tract (the saddle) ; /, lower part of spinal tract (rump tract) ; 

 i, crural tract; 0, femoral tract (very faintly seen in a Woodpecker) ;^, alar tract. 



■ Figure 3— Anterior or ventral aspect of the same specimen, with its head turned 

 to the left; a, capital tract ; «, the ventral tract, and w, its external branch. From 

 nature, by the author. 



