20 
Anat. Cuan. Unknown. © 
Tyee. Lrismatura. 
Hasir. Like the last, truly aquatic. 
GENUS I. THALASSORNIS. 
Ext. Cuar. Pedes digitis posterioribus lobatis, externis inter- 
mediis vix equantibus. Zibie plumose. Rostrum validum, latum ; 
lateribus parallelibus; et ungue magna armatum. Nares parve, 
ovales, in medio rostri culminem versus posite. Cauda rotundata, 
rectricibus brevibus et subrigidis instructa. Ale breves, remigibus. 
ad apices incurvatis. 
Ext. Cuan. Feet with the posterior toes lobated, the outer ones 
scarcely equal to the middle. Thighs feathered. Bill strong, broad; 
the sides parallel, and armed with a large nail. Nostrils small, oval, 
placed in the middle of the bill towards the culmen. wil rounded, 
furnished with short and slightly rigid feathers. Wings short, with 
the quills incurved at the apex. 
THALASSORNIS nobis. w=? 
TypE. Thaiassornis leuconotus. 
GENUS It. BIZIURA. 
Ext. Cuar. Pedes digitis posterioribus lobatis, externis inter 
mediis equantibus. Tibie plumose. Rostrum validum, latum, ad 
apicem angustatum. Mandibule ambe unguiculate, inferior in 
maribus palea magna pendente instructa. Nares rotundate, in medio 
rostri, culminem versus posite. Cauda rotundata, rectricibus rigidis — 
et acutis instructa. Ai@ remigibus, ad apices incurvatis. 
Ext. Cuar. eet with the posterior toes lobated, the external — 
ones equal to the middle. Zhighs feathered. Bill strong, broad, 
narrowed towards the apex. Both mandibles furnished with nails; 
the inferior one, in the males, with a large hanging wattle. Nostrils 
rounded, placed in the middle of the bill towards the culmen. Tail 
rounded, furnished with stiff and acute quills. Wings with the quills 
at the points incurved. — | 
Biziura. Steph., Leach. 
Type. Biziura lobata. 
Mons. Temminck included this genus, together with all the other 
aquatic ducks, in one large genus Hydrobates. The name of Biziura 
