AVES. 391 



sea-swallows and gulls which they have seen to capture fish, until these 

 let fall or disgorge the prey seized or swallowed, which then they catch 

 with watchful rapidit3^ 



B. Nostrils tubular. Feet tridactjloiis, with tarsi reticulato- 

 squamose. 



Haladroma Illig., Pelecanoides Lac, Gray. Bill short, de- 

 pressed at the base, compressed at the tip, hooked. Nostrils supe- 

 rior, contiguous. Wings short, with first quill longest. Tail short, 

 rounded. 



Sp. HaJadronia urinatrix, ProceUaria urinalrix Gm. ; New Holland ; — Hala- 

 droma Berardii Quoy, Temm. PI. col. 517; fi-om the Falkland Islands. 

 These small birds from the southern hemisphere much resemble Alca or 

 MerguhiS, but are easy to distinguish by the covering of the tarsi. 



Pachyptila Illig., Prion Lac, Gray. Bill moderate, depressed 

 at the base, Avith margins beset posteriorly with parallel lamella?. 

 Nostrils tubular, placed above the culmen of bill, opening by two 

 apertures. Wings moderate. Tail moderate, rounded. Claw ses- 

 sile, remote, in place of hallux. 



Sp. Pachyx)tliila vittata, ProceUaria vittata Foest., Gm., Temm, PI. col. 528, 

 Cuv. R. ani., ed. ill., Ois. PI. 91, fig. 4; South Africa, &c. 



Puffijius Ray, Briss. Bill moderate, slender, with tip of each 

 mandible curved. Nostrils tubular, placed above culmen of bill, 

 opening with double aperture. Wings long, pointed. Tail some- 

 what short, rounded. Remote claw in place of hallux. 



Sp. Puffinus major Faber, ProceUaria Puffinus L. (in part). Buff. PI. enl. 

 962 ; — Puffinus anrjlorum Ray (Procell. Puffinus L. in part), Puffinus 

 arcticus Fabee, Naum. Taf. 277, &c. 



ProceUaria L. (excl. many species), Illig. Bill moderate or 

 short, hooked at the tip; lower mandible shorter, with angle some- 

 what prominent. Nostrils in a tubule above the culmen of bill, 

 opening by a single apertm-e, divided by a partition. Wings long. 

 Tail mostly rounded. Claw sessile, raised, in place of hallux. 



Thalassidroma Vigors, Hydrohatus BoiE. Tarsus longer than 

 toes, slender. Wings with second and third quills subequal, longer 

 than first, the second longest of all. Tail even. 



Sp. ProceUaria pelagica L., Beiss. Ornith. vi. PI. 13, fig. i, Nozem. Ncderl. 

 Vog. III. bl. 245, Naum. Taf. 275, fig. i, Guee. Iconogr., Ois. PI. 62, 



