15 
Anas. Linn. 
Micropterus. ing. 
Type. Micropterus Patachonichus. 
Affinity. The structure of the hind toe and foot unites this genus 
to the Fuliguline ; while, on the other hand, that of the trachea bears 
a great resemblance to the Anatine. 
‘GENUS II. MELANITTA. 
Ext. Car. Pedes digitis posterioribus lobatis, et externis longis- 
simis. ostrum magnum, basi elevatum. Lamelle magne, ad mar- 
ginem continuate. ares ovales, magne, in medio rostri posite. 
Ext. Cuar. feet with the posterior toes lobated, the outer ones 
longest. Bill large, elevated at the base. Lamelle large, continued 
- tothe margin. Nostrils oval, large, placed in the middle of the bill. 
Metanitra. JBoie. 
Anas. Linn. 
OrpemiA. Lem. 
Typz. Melanitta fusca. 
Affinities. The form of the bill in some of the species of the 
genus presents an affinity to the genus Somateria. In its general 
form, however, and the structure of the feet, it bears a close resem- 
blance to the foregoing genus. 
GENUS III. SOMATERIA. . 
Ext. Cuar. Pedes digitis posterioribus lobatis, externis mediis 
equalibus. tostrum mediocre ad basin elevatum, et ad apicem, 
angustatum. amelle non ad apicem continuate. 
Ext. Cuar. Jeet with the hind toes lobated, the external ones 
equal to the middle. Bill moderate, with the base elevated, and nar- 
rowed towards the tip. The Zamelle not continued to the apex. 
Anas. Linn. 
SomaTeria. Leach. 
Type. Somateria mollissima. 
Affinity. Inthe form of the inferior larynx this genus approaches 
near the Anatine. ; 
GENUS IV. ENICONETTA. 
‘Ext. Cuar. Pedes magni, digitis posterioribus lobatis. Rostrum 
ad basin elevatum, ad apicem angustatum. Caput parvum, et 
_ cristatum maribus. Cauda brevis et acuta. Lemiges tertie longe, 
