INDEX TO KEY TO EAMILIES. 

 WATER BIRDS. 



Group I. Toes, four, with lobate web or web on sides of toes. 

 See page 23. 



Group 2. Toes, four; front toes, palmate (full webbed ); hind toe, 

 not connected with front ones by web. See page 24. 



Group 3. Toes, four; totipalmate (all toes full webbed); hind 

 toe, connected with front ones by web. See page 27. 



Group 4. Toes, four, not full webbed; small web between toes 

 at base, or toes entirely without web; hind toe, sometimes very small. 

 See page 28. 



Section i . Hind toe, raised above level of front toes. See page 28. 

 Section 2. Hind toe, on same level with front toes. See page 30. 

 Group 5. Toes, three, full webbed; no hind toe. See page 32. 

 Group 6. Toes, three, not full webbed; a small web between 

 toes at base, or toes entirely without web. See page t,;^. 



