OiiDEii AN SERES. 



THE LAMELLIROSTRAL SWIMMERS. 



Char. Lamellirostral Swimming Birds, with straight hills, short legs (always 

 shorter tliaa the wing), the tibiae usually completely feathered, and scarcely free 

 from the body ; hallux well developed, though usually small, never absent. Eepro- 

 ductiou priBcocial, and young ptUopaidic; eggs numerous and unmarked, with a 

 hard, usually very smooth, shell. 



Like the Fhamicojjteri, the Order Aiiseres is composed of a single family, wliieh. 

 however, includes very numerous genera and species. The Order is represented in 

 every portion of the globe, but most numerously in the northern hemisphere. 



Family ANATID^E. — The Swans, Geese, and Ducks. 



Char. The same as those of the Order. 



The Family Anatidce, which includes all the known AnKeres proper, or Lamelli- 

 rostral Swimmers, constitutes so well-marked and natural a group of birds as to need 

 no further definition than that given above. The Anatidce are allied most nearly to 

 the Phnmicopter'ulw, or Flamingoes, whicli, however, are trenchantly separated by 

 many striking peculiarities of structure. The species being very numerous, naturally 

 fall into several more or less well-defined groups, which have been accorded the rank 

 of sub-families. These, however, grade so insensibly into one another, that it is 

 extremely doubtful whether this rank can be maintained for them.^ Birds of this 

 family are found in every known part of the world ; but they abound most in the 

 northern hemisphere, particularly in boreal regions. The Xorth American rejjre- 

 sentatives may, for convenience of classification, be divided into three tolerably 

 well-defined groups, as follows : — 



Cygninse. Neck extremely long (as long as or longer than the body) ; size very large ; bill 

 lunger than the head, the edges parallel, the nail small ; tarsi shorter than middle toe ; 

 lores naked ; tail-feathers 20-24 ; color chiefly or entirely white (except in Chenopis 

 atrata, the Black Swan of Australia). 



' " The wlicile family Analulcc forms, as to structural features, a very homogeneous group, and inter- 

 mediate links are everywhere to be found. Thus it is very difiBcult to define the sub-families anatomically, 

 and to give the stractural differences by which they are to be separated, so that I find it not improbable 

 that an exact investigation, based on a more abundant material than I can at present procure, will reduce 

 the sub-families to groups of lower rank." — Stejkegek, in Proc. U. S. Nat. Mus., Vol. 5, 1882, pp. 

 174, 175. 



