171 
ANSERES. 
GENUS XXXI. 
ANAS— DUCK. 
The Linnaean characters of this genus, 
are 
Bill, convex, obtuse, the edges divided 
into lamellate teeth. 
Tongue, fringed, obtuse. 
Three fore-toes, connected, the hind-one 
solitary, 
Gmelin enumerates one hundred and 
eighteen species, besides varieties belongs 
ing to this genus, which he divides into 
two parts ; the first of which includes those 
whose Beaks are gibbous at the base, and 
the second those whose beaks are equal at 
the base. 
The Birds comprised in this genus, live 
for the most part upon the water, swim- 
