ANATIX^E — THE DUCKS — SOMATERIA. 



77 



Europe," Pt. IV., p. 14), other than those defined above. We find the falcate tertials equally 

 developed in specimens of both forms, while the extent of the green of the head is quite variable, 

 according to the individual. 



The accompanying outline figures will serve to show the great difference in the form of the bill, 

 especially its basal portion, in the two species. 



& Dresseri, $ ad. 



