1876.] 



ANATOMY OF CHAUNA DERBIANa. 



Table. 



199 



In conclusion, it seems to me that from considerations of ptery- 

 losis, visceral anatomy, myology, and osteology, the Screamers cannot 

 be placed along with the Anserine birds. In the windpipe and the 

 form of the angle of the jaw they, no doubt, closely approach them. 

 In their alimentary canal they are much nearer to Struthio and 

 Rhea (not Dromceus and Casuarius) than to any other birds. There 

 is a Ciconine tendency in their myology, whilst their osteology points 

 in no special direction. It seems, therefore, to me that, summing 

 these results, the Screamers must have sprung from the primary 



