SWIMMING BIRDS. 



467 



The Gannets (^Sula] and tlio Tropic Birds {Phaetm^ are of similar 

 structure and habits, but of smaller dimensions. 



Q 



'Jo.— THE GAXNET. 



In the family of lamellirostres* the beak is thick 

 and covered Avith a soft skin instead of true horn ; 

 its edges are furnished with ridges resembling little 



Fig. 396.— beak of duck. 

 * T-«mella, a flat plate ; lostrum, a heah 



