PEOCELLAKIID^ PEIOCELLA 473 



some feathers on the flanks, under wing coverts and some of the 

 under tail-coverts grey. 



Iris dark brown ; bill greenish-yellow, the nostrils and culmen 

 black, mandible greenish-horn, the lines of division black ; tarsi and 

 toes bluish-brown, the outer toe darker, the webs with a yellow 

 tinge. 



Length (in fiesh) 18-0; wing 12'75 ; tail 4-25; tarsus 2-20; 

 middle toe 2-40; culmen 205. 



Distribution. — The Great Grey Petrel is found throughout the 

 Southern Ocean and is generally distributed between the 30th 

 and 56th parallels of South latitude. It was found ~ breeding 

 on Eound Island near Mauritius many years ago by Mr. Layard, 

 and is stated to nest on Kerguelen by Captain Hutton {Ibis, 1865, 

 p. 286) but it has not been noticed since by the Transit of Venus 

 Expedition or by Mr. Hall. 



This Petrel is not uncommon in the Cape Seas ; Captain Hutton 

 obtained it in April, 1866, in 36° S. lat., 2° E. long., and in 35° S. 

 lat., 15° E. long. ; Lord Lindsay on September 21, in 35° S. lat., 

 9° E. long., and the Southern Cross Expedition in 42° S. lat., 20° E. 

 long., while there is an example in the South African Museum, 

 a female obtained in September, 1903, by Captain Turbyne of the 

 S.S. " Pieter Paure," about forty miles west of Cape Point. 



Genus III. PRIOCELLA. 



Type. 

 Priocella, Hombr. d Jacq. Compt. Bend, xviii, 



p. 357 (1844) P. glacialoides. 



This genus is closely allied to Puffinus, but the nasal tube is 

 longer, about one-third of the length of the bill and opens for- 

 wardly ; there are fourteen tail-feathers instead of twelve. 



Only one species, found throughout the Southern Ocean, is 

 assigned to this genus. 



789. Priocella glacialoides. Silver-grey Petrel. 



Procellaria glacialoides, Smith, III. Zool, S. Afr. Aves, pi. 51 (1840) ; 



Lwya/rd, B. S. Afr. p. 361 (1867). 

 Thalassoeoa tenuirostris (nee Tenim.), Sharpe, eel. LayartVs B. S. Afr. 



p. 767 (1884). 

 Priocella glacialoides, Salviii, Cat. B.M.xxv, p. 393 (1896); Shelley, 



B. Afr. i, p. 167 (1896) ; Parhiv, Ibis, 1900, p. 675; Eeichenow,rdg. 



Afr. i, p. 27 (1900) ; Vnuhoffeu, .Tourn. Ornifh. 1901, p. 310. 



