192 ANATIDJ5. 



but resemble them in form and colour. They measure from "2-42 

 to 3 in length, and from 1*6 to 1*9 in breadth. 



2. Melville Island, Arctic America Crowley Bequest. 



(H. Piers: Tristram Coll.). 

 1. Anderson River, Arctic America, Salvin-Godman Coll. 



6th July (R. MacFarlane: Smiths. 



Inst.). " 

 1. Anderson River, 6th July (R.MacF.: Salvin-Godman Coll. 



Smiths. Inst.). 

 4. Franklin Bay, Arctic America (R. Salvin-Godman Coll. 



MacF.). 

 1. Cambridge Bay, Arctic America Voy. II. M.S. 'Enterprise.' 



(Capt. Collinson). 

 7. Repulse Bay, Hudson's Bay, 9th Dr. J. Rae [P.]. 



July. 

 1. Floe-berg Beach, Lat. 82 27' N., Voy. H.M.S. 'Alert.' 



July (Col. H. W. Feildcn). 

 1. Floe-berg Beach, Lat. 82 28' N., Toy. H.M.S. 'Alert.' 



18th July (H. W. F.). 



1. Davis Straits, May. Crowley Bequest. 



1. Greenland (Holboll). Salvin-Godman Coll. 



1. Disco, Greenland. McCormick Bequest. 

 (\ S.W. Greenland, 20th June. Crowley Bequest. 



2. Labrador. Crowley Bequest. 



1. Novaya Zemlya, 12th July. Seebohm Coll. 



Sub-Family ERISMATURIN.E. 



Genus THALASSORNIS, Eyton. 



Thalassornis leuconotus (Smith). 



Thalassornis leuconota, Sharpe, ed. Layard's Birds S. Africa, p. 761 



(1875-84) ; Butler, Feilden $ Reid, Zool. 1882, p. 428. 

 Thalassiornis leuconota, Salvadori, Cat. Birds B. M. xxvii. p. 436 (1895). 

 Thalassoruis leuconotus, Sharpe, Hand-l. i. p. 226 (1899). 



The eggs of the White-backed Duck are short ellipses and re- 

 semble those of the Ducks of the Erismatura group in having the 

 shell rough and granulated. They have a slight gloss and are of 

 a pale greenish-white colour. Two specimens measure respectively 

 2-6 by 2 ; 2-55 by 2. 



2. Newcastle, Natal, 18th Sept. Crowley Bequest. 



(E. A. Butler). 



Genus NOMONYX, Eidgw. 



Nomonyx dominions (Linn.). 



Nomonyx dominions, Baird, Brewer fy Ridqw. Water Birds N. Am. ii. 

 p. 109 (1884) ; Scl. $ Huds. Arr/ent. Orn. ii. p. 138 (1889) ; Holland, 

 J/nX 1892, p. 209; Salvador*. Cat. Birds B. M. xxvii. p. 438 (1895) ; 

 Sharpe, Hand-l. i. p. 227 (1899) ; Nehrk. Kat. Eiersamml. p. 247 

 (1899) ; von Ihering, Rev. Mus. Paulista, iv. p. 281 (1900). *- 



The eggs of the Masked Duck in the Collection are of an oval 



