520 



NATATORES. 



LARlDiE. 



LARIDjE. 



THE FORKED-TAILED PETREL. 



Procellaria Leachii, Fork-tailed Petrel, 



,, Bullockii, ,, ,, ,, 



Thalassidroma ,, ,, ,, Storm,, 



Procellaria Leachii, Leach's ,, 



Thalassidroma Bullockii, Fork-tailed ,, 



,, Leachii, ,, ,, Storm,, 



Procellaria , , Petrel de Leach, 



Thalassidroma ,, Thalassidrome,, 



Bewick, Brit. Birds, vol.ii. p. 261. 

 Flem. Brit. An. p. 136. 

 Selby, Brit. Ornith. vol. ii. p. 537. 

 Jenyns, Brit. Vert. p. 286. 

 Eyton, Rare Brit. Birds, p. 101. 

 Gould, Birds of Europe, pt. xi. 

 TEMM.Man. d'Ornith. vol.ii. p. 842, 

 „ ,, „ vol. iv. p. 512. 



This species of Petrel is but very little smaller in size 

 than tlie bird last described, but is at once distinguished from 

 it by its forked tail, and its shorter legs. The first specimen 

 of this bird was obtained at St. Kilda in the summer of 

 1818, by Mr. Bullock, during a tour round the coast of 

 Scotland, principally undertaken with a view to investigate 

 its ornithology. At the sale of Mr. Bullock's collection in 

 the spring of 1819, this specimen was bought by Dr. Leach, 

 and transferred to the national collection in the British Mu- 



