On the arrangement of the genera of Birds. 405 



II. Fam. Colymbid^. Leach. [Gen. Colymbus. Linn.] 



Podiceps. Lath. [Colymbus. Briss. IU.~\. — Colymbus. Aud. 

 [Mergus. Briss. Eudytes. lll.'\ 



III. Fam. AlcadjE. [Gen. Alca. Linn.] 



Uria. Briss. — Cephiis. Cuv.? — Mergulus. Ray. — Phaleris. 

 Temm. [Alca. Vieill.~\ — Fratercula. Briss. [Mormon. III. 

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

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

 Vieill.'] — Aptenodytes. ForsL 



IV. Fam.Pelecaniu^. Leach. [Gen. Pelecanus. Phaeton. P lotus. 

 Linn,] 



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

 Halieus. III. Hydrocorax. VieilL~\ — Sula. Briss. [Dyspo- 

 rus. ///. Morus. Vieill.'] — Tachypetes. Vieill. — Phaeton. 

 Linn. [Lepturus. Briss.] — Piotus. 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. ///. Praedatrix. 



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



III. — Procellaria. Auct. — Pachyptila. III. — Puffinus. Ray. 



— Thalassidroma. (*) 



* Thalassidroma. 



Rostrum subbreve attenuatum, compressissiinum, apice subito deorsum cur- 

 vato : naribus prominentibus in tubum unum conjunctis. 



jiliB longae acuminataa; remige Ima 3tia bre\iori, 4ta longiori, 2da long- 

 issima^ 



Pedes subgraciles ; tarsis elevatis, acrotarsiis paratarsiisqne integris. 



Typus genericus, Procellaria pelagica. Linn. 



l^To be continued,] t-u n 



