508 



CETOSPARACTES EBURNEUS. 

 WHALE-GULL. 



THE IVORY 



IVORY GULL. WHITE GULL, SENATOR. SNOW-BIRD. 



Larus ebnrncus. Cimel. Syst. Nat. I. o96. 



Larus ebuvneus. Lath. Ind. Ornith. II. 816. 



Moriettc blanche ou Senateur. Larus cburueus. Tomni. Man. d'Ornitli. 



II. 769; III. 474. 

 Ivory Gull. Larus eburneus. Selb. Illustr. II. 497. 

 Larus eburneus. Ivory Gull. Jen. Brit. Vert. An. 276. 

 Gavia eburnea. Bonap. Comp. List. 



Bill short, stout, an inch and a third in length, half an 

 inch high at the knoh ; tarsus very short, rough, an inch and a 

 half long ; tail a little rounded ; interdigital membranes 

 emarginate, strongly cremdate, the outer tcith an abrupt sinus. 

 Adult toith the hill greenish-grey, yelloxo, tinged with red, be- 

 yond the nostrils ; feet black ; plumage white, slightly tinged 



