24 
c, Webs between all toes (3 webs) 
Full-Webbed Swimmers — Gannets, Cormorants, etc, 
p. 70 
d, Bill toothed or flattened (Duck-like). 
Sieve-billed Swimmers— Mergansers, Ducks, Geese, and Swans. . p. 75 
e, Nostrils in tubes on top of bill. 
Figure 11 
Tube-nosed Swimmers — Petrels, etc 
p. 65 
