GANNETT 11 
impure white. ‘The adult plumage is very gradually 
assumed, and is not completed until the sixth year. 
Brak. Pale bluish-grey, tinged with green at the base ; 
strong and cone-shaped ; point slightly hooked. 
FEET. Greyish-black. 
Ir1pEs. Vary from pale straw-yellow to silvery-white ; 
surrounding bare skin, greenish. 
AVERAGE MEASUREMENTS. 
TOTAL LENGTH ... nes eo in. 
WING a Ra fs ae, LG. 5 
BEAK ARS we nearer A! * 
TARSO- METATARSUS a cee OE DOnae 
ae eis oe re es Ore ke Quins 
Allied Species and Representative Forms.—‘‘ A Tropic 
bird, Phethon ethereus, is said to have been found dead 
in Herefordshire more than forty years ago. (J. H. 
Gurney, Tr. Norfolk Soc. v. p. 659).”’ (Saunders.) 
