19 
‘ec, Webs between al! toes (3 webs) 
Figure 6. 
Pull-Webbed Swimmers—Gannets, Cormorants, etc.,.............. 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—Petvrels, ete... ......... 0. cc cee eee ees p. 56. 
