1889.] 



ANATOMY OF PICARIAN BIRDS. 



589 



seen to be connected with the antepenuUimate ring. Although the 

 last tracheal rings are not fused, thej are very closely applied together 

 and no membranous interspaces are left. 



Fig. 1. 



Syrinx of Bucorvus abyssinicuK Front view. 



Fig. 2. 



Syrinx of Buceros rhinoceros. Front view. 



Ceratogymna elata, which is, like the last, a comparatively small 

 species, has a very similar syrinx ; indeed I can find no dilFerences 

 sufficiently tangible to be described. 



