GENERAL INDEX. 
ccxxii* 
VOL. PAGE 
OENUS MERGES. 
Bill slender, sub-cylindrical, toothed, hooked at the 
point, both mandibles furnished with a strong nail ; nos- 
trils small, lateral, elliptical, pervious, placed near the 
middle of the bill ; throat toothed ; legs placed pretty 
far back ; feet greatly compressed, fore toes entirely 
palmated, hind toe lobed. 
Goosander, {M. mergamer) 
viii 
70 
Female of ditto 
viii 
74 
Hooded Merganser, {J\I, cucullatus) 
viii 
82 
Red-breasted M. ( J\L serrator ) 
viii 
84 
Smew or White Nun, ( M» albellus ) 
viii 
136 
GENUS PLOTUS. 
Bill long, straight, very sharp-pointed, jagged or 
serrated ; nostrils a slit near the base, concealed by a 
membrane ; face and jugular pouch naked ; legs placed 
far back ; feet very short, strong, four-toed, all connected 
by a broad membrane, middle claw pectinated; tongue 
very small ; tail long and fan-shaped. 
Darter or Snake-bird, ( P. anhinga ) - - ix 244 
Female of ditto - - - ix 249 
GENUS COLYMBUS. 
Bill strong, straight, sharp-pointed, compressed ; 
nostrils basal, lateral, oblong ; throat toothed ; legs 
placed far back, extended horizontally ; feet strong, 
tarsus greatly compressed, the three forward toes very 
