44 BIRD GALLERY. 



emerge from beaeath the surface flying. Unlike the other Petrels^ they 

 are generally found singly or in pairs and nest sporadically. 

 [Ca=es The second subfamily Procellai'iiruB includes the true Petrels. The 

 ' " -^ Shearwaters {Puffinus) are numerously represented in all the great 

 oceans of the worlds and derive their name from their curious habit of 

 skimming just over the surface of the waves. The Manx Shearwater 

 (P. anglorum) (370) is widely distributed over British waters throughout 

 the year, and breeds on many of the islands off the coast, while the 

 Greater (372), Sooty (368), and Little Dusky (369) Shearwaters are 

 visitors to our shores, the latter being much the rarest. 



The allied genus (Estrelata, including some thirty species, is interesting 

 from the fact that two of the species have each been recorded once from 

 Britain. Of these a specimen of the Collared Petrel (GE. brevipes) (365) 

 killed in Wales is exhibited, but the Capped Petrel (CB. hwsitafa) is so 

 rare that only one example exists in the Museum collection. 



Bulwer's Petrel [Bulweria buJweri) (364), a curious sooty-black form, 

 is common in the Madeiran waters, and has occurred once in Yorkshire 

 and once in Sussex, where a specimen was picked up dead. The Pintado 

 Petrel or " Cape Pigeon " {Daption capensis) (363), as its name implies, 

 is numerous ofE the South African coast, and well-known from its habit 

 of accompanying ships for the sake of the scraps of food thrown over- 

 board. Lastly we may draw attention to the beautiful Snowy Petrel 

 [Pagodroma nivea) (362), a native of the icy regions of the South. 

 [Case -24:.] On the floor of this Case will be found the Giant Petrel or " Nelly " 

 {Ossifraga gigantea) of the Southern seas, the largest of the true Petrels. 

 Apart from its size this species is remarkable for possessing both a light 

 (376) and a dark (377) phase of coloration, some individuals being dark 

 brown and others almost entirely white. Examples of both types are 

 shown. The Fulmar Petrel {Fulmarus glacialis) (379) is a well-known 

 inhabitant of the seas of Arctic Europe, and nests within our limits on 

 St. Kilda and the Shetland Islands. Two phases of plumage are known, 

 some examples having the under surface white, while in others these 

 parts are grey. The Broad-billed Blue Petrel {Prion ariel) (380) 

 represents a small group remarkable for the presence on each side of the 

 bill of long lamellae, resembling those of the Ducks. Of the small long- 

 legged Petrels, commonly known as " Mother Carey's Chickens," and 

 placed by some authors in a separate subfamily, OceanitintB, quite a 

 number appear on the list of British Birds. Two, the Storm-Petrel 

 {Procellaria pelagica) (381) and Leach's Pork-tailed Peti-el [Oceanodroma 

 leucorrhoa) (382), breed on some of the islands off the west coast of 

 Britain, while Harcourt's Storm-Petrel (O. castro) (383), Wilson's 

 Storm-Petrel {Oceanites oceanicus) (387), and the beautiful White- 

 breasted or Frigate-Petrel (Pelagodroma marina) (385) are accidental 

 visitors to our shores. 



