GANNET 11 



impure white. The adult plumage is very gradually 

 assumed, and is not completed until the sixth year. 



BEAK. Pale bluish-grey, tinged with green at the base ; 

 strong and cone-shaped ; point slightly hooked. 



FEET. Greyish-black. 



IRIDES. Vary from pale straw-yellow to silvery-white ; 

 surrounding bare skin, greenish. 



AVERAGE MEASUREMENTS. 



TOTAL LENGTH 34 in. 



WING 19 



BEAK .>/ 4 



TARSO-METATARSUS ... ... 2'25 ,, 



EGG 3-25X1-9 in. 



Allied Species and Representative Forms. "A Tropic 

 bird, Phcethon cethereus, is said to have been found dead 

 in Herefordshire more than forty years ago. (J. H. 

 Gurney, Tr. Norfolk Soc. v. p. 659)." (Saunders.) 



