508 STRUCTURE AND CLASSIFICATION OF BIRDS 



and MITCHELL noted in the former genus that the gall 

 duct and the pancreatic duct opened into a distinct diverticu- 

 lum of the duodenum. 



FIG. 237. SYEINX OF Rhea amcricana. FROXT VIEW. (AFTEK FOEBES.) 



In Apteryx there is a gall bladder. 



The chief source of information about the windpipe and 



FIG. 238. THE SAME, FROM BEHIND. 



syrinx of the Struthionidae is contained in a memoir by 

 FOEBES. J These birds, as a rule, possess no specially modified 



1 ' On the .... Trachea in the Eatite Birds,' P. Z. S. 1881, p. 778. 



