On the arrangement of the genera of Birds, 405 



II. Fa.m. Colymbid^. Leach. [Gen. Colymbus, Linn.] 



Podiceps. Lath. [Colymbus. Briss, III.']. — Colymbus, Auct, 

 [Mergus. Briss, Eudytes. 111."] 



III. Fam. Alcad^. [Gen. ^^ca. Linn.] 



Uria. Briss, — Cephus, Cuv.^^Mergulus. Ray, — Phaleris. 

 Temm. [Alca. Vieill,'] — Fratercula. Briss. [Mormon. ///. 

 Larvae pars. Vieill.~\ — Alca. Auct. [Larvae pars. Vieill.'] 

 — Spheniscus. Briss. — Catarrhactes. Briss. — [Eudyptes. 

 Vieill.~\ — Aptenodytes. Forsi. 



IV. Fam. PELECANiDiE. Leach. [Gen, Pelecanus, Phaeton, Plotus, 

 Linn.] 



Onocrotalus. Briss. — Phalacrocorax, Briss. [Carbo. Meyer, 

 Halieus. III. Hydrocorax. VieHl.] — Sula. Briss. [Dyspo- 

 rus. III. Moras. Vieill,'] — Tachypetes. Vieill. — Phaeton. 

 Liinn. [Lepturus. Briss.] — Plotus. Linn. [Anhinga. Briss.] 



V. Fam. Larid^. Leach. [Gen. Sterna. Rhynchops, Larus. 



Diomedea. Procellaria, Linn.] 



Sterna, Linn, — Rhynchops. Linn. [Rygchopsalia. Briss.] — ^ 



Larus. Auct. — Stercorarius. Briss. [Lestris. ///, Prsedatrix. 



Vieill.] — Diomedea. Linn. [Albatrus. Briss.] — Haladroma. 



///. — Procellaria, Auct. — Pachyptila. Ill, — Puffinus, Ray, 



— Thalassidroma, (*) 



* Thalassidroma. 



Rostrum subbreve attenuatum, compressissimum, apice subito deorsum cur- 

 vato : naribus prominentibus in tubum unum conjunctis, 



uilcB longae acuminatae; remige ImS, 3ti|l breyiori, 4ti longiori, 2d4 long- 

 issimS.. 



Pedes subgraciles ; tarsis elevatis, acrotarsiis paratarsiisqne integris. 



Typus genericus, Procellaria pelagica. Linn. 



[To be continued.] 



