366 ON THE CLASSIFICATION OF BIRDS. 
Cereopsis, Lath. Pigeon 
Goose. (fig. 327.) Bill 
short, very much thick- 
ened at its base. Nos- 
trils central. Tarsus 
with hexagonal scales. 
Toes semipalmated. 
The grallatorial type. 
C. australis. P. C. 206. 
Susram. ANATINZ, Sw. River Ducks. 
Bill broad and lengthened Nostrils basai. Legs very 
short. Hinder toe slightly lobed. (fig. 329. d) 
Marica, Leach. Widgeon. Bill very short and small, 
of equal breadth throughout ; the tip not narrowed. 
Tail long, pointed. 
M. Americana. Wilson, pl. 69. f. 4. 
DenpDRONESSA, Sw. T'ree 
Ducks. ( fig.328.) Bill 
small, short, rather 
compressed ; the tip 
contracted. Nostrils 
towards the middle of 
the bill. Head crested. 
Tertial quills recurved. 
D. sponsa. Wilson, pl. 70. f. 3. galericulata. Edw. pl. 210. 
Anas, Linn. Typical Ducks. Bill flattened from the 
base, longer or as long as the head ; the tip broad, 
and never contracted. ¥ 
Chauliodus, Sw. (fig. 330. b) Bill of equal bread ns 
throughout. The lamina fine, but not much pro-— 
jecting beyond the margins. — 
C. Strepera. Selby, pl. 51. 
Malacorynchus, Sw. (fig. 329. a) Bill like the last ; 
the substance soft, and the tips of the upper mandi- 
ble furnished on each side with a loose angular skin, 
_ Australia. 
