PALMIPEDES. 423 



dei-ed with a membrane, have a larger head, a shorter neck, the 

 feet placed farther back, smaller wings, a stiffer tail, more com- 

 pressed tarsi, longer toes, and the membrane of the feet more entire. 

 They walk with more difficulty, feed more exclusively on fish and 

 insects, and dive more frequently.(l) Among them we may distin- 

 guish the 



OiDEMiA, Fleming. 



By the breadth and inflation of the bill. 



Jlnas nigra, L.; La Macreuse commune, Enl. 972j Naum. 

 Supp. 14, f. 28 and 29; Brit. Zool. pi. 2, 6; Wils. VIII, Ixxii, 

 2 (The Scoter), is all black, greyish when young; the bill 

 very broad with a protuberance on its base. It is found in 

 large flocks on the coast of France, where it feeds chiefly on 

 muscles. The An. cineraceus, Naum., I, C. 60, f. 91, 92, is the 

 young female. 



An. fusca,h.; La double Macreuse, Enl. 956; Frisch, 165; 

 Naum. I, c. Supp. f. 15 and 16; Wils. LXXII, 3 (The Velvet 

 Duck), diff'ers in its superior size, a white spot on the wing, 

 and a white streak under the eye. There is a circular, vertically 

 flattened inflation in the middle of its trachea. 



An. perspicillata, L.; Enl. 995; Edw. 155; Wils. VIII, Ixvii, 

 1. (The Black Duck.) Some white on the occiput and behind 

 the neck; the naked and yellow skin of the base of its bill also 

 surrounds the eyes. 



New Holland produces a speckled species, remarkable for a 

 large fleshy appendage that hangs under its bill, An. lobata, 

 Nat. Misc., VIII, pi. 255,and Col. 406.(2) 

 We may also separate 



Clangula, Leach. 



In which the bill is short and narrower towards the end; and 

 place first on the list, those species the middle quills of whose tail 

 are the longest, which renders it pointed. Such are 



An. glacialis, L., Enl. 1008; Edw. 280; Naum. 52, f. 76; Wils. 

 VIII, Ixx, 1, 2; the young male, Enl. 999; Naum. 52, f. 76, B; the 

 adult in wedding livery, Edw. 156. (The Long-tailed Duck.) 



(1) This division constitutes the genus Piatipus, Brehm.; or HynaoBATXs, 

 Tem.; or Fuhgula, Ch. lionap. 



(2) Add the .Rnas mersa and leucocep/uila, Voy. de Pall. fr. tr., pi. v and vi; 

 Naum. Sup. 40, f. 79, 80; the An. brachypUra, Lath., Voy. de Freycin. pi. 

 xxxix. 



