INDEX TO KEY TO FAMILIES. 



WATER BIRDS. 



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



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



with front ones by web. See page 12. 



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

 with front ones by web. See page n't. 



Group 4. Toes, lour, not full webbed ; small web between toes at base, or toes 

 entirely without web ; hind toe, sometimes very small. See page 17. 



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



SectiiHi 2. Hind toe, on same level witli front toes. See page 19. 

 Group ,S. Toes, three, full we))bed; no hind toe. See page 21. 

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

 entirely without web. Sec, i):ige 28. ' 



(10) 



