INDEX TO KEY TO FAMILIES. 



WATER BIRDS. 



Group 1. Toes, four, with lobate web or web on sides of toes. See page 11. 



Group 2. Toes, four; front toes, palmate (full webbed) ; hind toe, not connected 

 with front ones by web. See page 12. 



Group 3. Toes, four; toto-palmate (all toes full webbed); hind toe, connected 

 with front ones by web. See page 15. 



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 17. 



Section 1 . Hind toe, raised above level of front toes. See page 17. 



Section 2. Hind toe, on same level with front toes. See page 19. 

 Group 5. Toes, three, full webbed; no hind toe. See page 21. 

 Group 6. Toes, three, not full webbed ; a small web between toes at base, or toes 

 entirely without web. See page 23. 



UO) 



