PLATE I. 



Fig. 1. — A Hooked Bill, as in the genus Falco. Cere, a bare 

 soft skin at the base of the Bill, fig. 15, 



Fig. 2. — A Serrated or Notched Bill, as in the genus 

 Ramphastos. 



Fig. 3. — A Cultrated Bill, as in the genus Corvus. Reflected 

 Vibrissas, fig. 16. 



Fig. 4. — A Cuneated ox Wedge-shaped Bill, as In the genus 

 Picus. A cylindrical extensile tongue, 17, 



Fig. 5. — A Curvated Bill. An erected Crest, fig. 18. 



Fig. 6. — t^ostrili covered by or contained in a tube, as in the 

 , genus Procellaria. 



Fig. 7. — A Strait, compressed, cultrated Bill. Lore a bare 

 skin surrounded the eyes, fig. 20. Projecting edge 

 of the upper mandible, by means of which, the 

 Birds whose Bills are thus constructed, cut their 

 food as with scissors, fig. 24. 



Fig. 8. — A Hooked notched Bill, as in the genus Lanius; the 

 notch, fig. 21. 



Fig, 9. — A Recurved Bill, as in the genus Recurvirostra. 



Fig. 10. — A Grooved Bill, as in the genus Alca. 



Fig. 11. — A Spoon-shaped Bill, as in the genus Platalea. 

 Nail at the tip of the Bill, fig. 22. 



Fig. 12.— A compressed Bill, as in Geese. 



Fig. 13. — A depressed "BnW, as in Ducks. 



Fig. 14. — A Serrated or Toothed Bill, as in the genus Mergus. 



