They are also-subject to a regular change every spring and
autumn.” - .
The lower part of the trachea^ here introduced from Mr.
Audubon’s work, is, as noticed by Mr. Blyth, of small size,
and decidedly different, in form from that of the European
Wigeon.
EIDER DUCK. 201
NATATORES. ANATJDJE.
T H E E ID E R DUCK,
or S t . C u t h r r r t ’s D u c k .
Anas ' mollissima,
Somateria" ,
Anas ' " ,
Eider Duck, P enn. Brit. Zool. vol. ii. p. 243;
■ ,, j,; M ont. Ornith. Diet..
„ ; ;n , • I^ewick, Brit. Birds,,vol. ii. p. 322.
(towwlm Eicter, FLem. Brit. An. p. 119.
,, ,, - Selbv, Brit. Ornith. vol. ii. p. 338.
Eide,f Duck,, J enyns, Brit. Vert. p.;237.
,, Go'ueb , Birds'of, Europe, pt. iv.
= Canard Eider, TEMM.,Man. d’Ornith. vol. ii. p. 848.
Somatekia. Generic Characters.—Bill swollen and elevated at the base ;
extending ut>. on "the forehead, where it is divided by an elongated, descending,
angular projection of feathers down the surface. Nostrils lateral, oval, small.
