HEEODIONES 



437 



to the formation of these spirals, which are also found in the 

 Accipitres. 



The windpipe in the ibises is simple, not convoluted; 



Fia. 207. — Intestines of Flatalea leucorodia (attee Mitchell). 

 a:, short-circuiting vessel divided. 



but in Platalea leucorodia it is convoluted.^ In this bird 

 the windpipe runs in a straight or slightly sinuous course 



Fig. 208. — Intestines oe Ciconia nigra (aetek Mitchell). 

 :;, as in fig. 207. 



into the thorax ; it then bends upon itself, and after an inch 

 and a half or so reverts to its original direction, and divides 

 within the thorax into the two bronchi. 



' I have a windpipe of P. leucorodia which is not convoluted, but which 

 bifurcates within the thorax. 



