198 



MR. A. H. GAltKOD ON THE 



[Feb. 1 , 



Fig. 1. 



Fiar. 3. 



Fig. 4. 



Fig. 2. 



u 



1A 



t'Wf v Ml 



Fig. 1. Chauna derbiana. Back view of skull. 



Fig. 2. Chloephaga magellanica. Buck view of skull. 



Fig. ?>. Mitua tuberosa. Back view of skull. 



Fig. 4. Chauna derbiana. Base of skull. 



