19 
c, Webs between all toes (3 webs) 
Figure 6. 
Full-Webbed Swimmers—Gannets, Cormorants, ete.,.............. p. 59. 
Figure 9. Figure 10. 
d, Bill toothed or flattened (Duck-like). 
Sieve-billed Swimmers—Mergansers, Ducks, Geese, and Swans..... p. 62. 
e, Nostrils in tubes on top of bill. 
Figure 11. 
Tube-nosed Swimmers—Petrels, ete... . 2.0.2... 0c hee cece cecees p. 56. 
