Otitt procellamiiform.es. 
No. 51. 
Family PRO CELL A RI1DM. 
THALASSOICA ANTARCTICA. 
ANTARCTIC PETREL. 
(Plate 37.) 
Thalassoica Reichenbach, Nat. Syst. Vog., p. iv., 1852 (1853). Type (by original designation) : 
Procellaria antardica Gmelin. 
Lipetes Forbes, Voy. Chall., Zool., p. 59, 1882 (fig. head). Type (by original designation) : 
Procellaria antardica Gmelin. 
Peocellaeia Antarctica Gmelin, Syst. Nat., Vol. I., pt. n., p. 565, April 20th, 1789 : Antarctic 
Circle. 
Antarctic Petrel Forster, Voy. round World, Vol. I., p. 108, 1777 (pref. March 1st) ; Latham, 
Gen. Synops. Birds, Vol. III., pt. 2, p. 400, 1785. 
Procellaria antardica Gmelin, Syst. Nat., Vol. I., pt. n., p. 565, April 20th, 1789. 
Priocella antardica Sharpe, “ Voy. Erebus and Terror,” p. 37, pi. 33, 1875. 
Thalassoica antardica Salvan, Cat. Birds Brit. Mus., Vol. XXV., p. 392, 1896 (pref. Dec. 16th, 
1895) ; Sharpe, Rep. Coll. Nat. Hist. “ Southern Cross,” p. 143, 1902 ; Wilson, Nat. 
Antarct. Exped., Nat. Hist., Aves, p. 82, 1907 ; Mathews, Handl. Birds Austral., p. 16, 
Jan. 1908; Godman, Monogr. Petrels, p. 161, pi. 42, Sept. 1908; Mathews, Syst. Av. 
Australas., p. 116, 1927. 
Distbibution. Antarctic Seas. 
Adult male. Feathers surrounding the base of the bill greyish-white ; top of the head and 
feathers surrounding the eye dark greyish-brown ; back of the neck and upper mantle 
ashy-brown; mantle, lower back, shorter upper tail-coverts and scapulars like the head ; 
longer upper tail-coverts pure white ; tail white, with a broad greyish-brown bar at the 
tip; primaries ash-brown on the outer web and at the tip of the inner web ; remainder 
of the inner web white ; secondaries and secondary-coverts white ; throat rusty-white ; 
remainder of the under-surface white ; under aspect of wings white, bordered along the 
bend of the wing with ash-brown ; bill blackish-hom, the cutting edge of the mandible 
lemon-yelkw; eyes dark brown ; legs, toes and webs pale fleshy-grey, claws blackish. 
Total length 440 mm.: wing 320, tail 122, tarsus 43, culmen (exposed) 38. Figured. 
Collected on the 31st of December, 1898, at 159° 25' long., 62° 52' lat. 
Adultfemale. Similar to the adult male. 
Fkom Dr. E. A. Wilson I take the following. The difference between this bird 
as seen in a museum, and in its native habitat is very noticeable. The clean- 
moulted bird is very handsome, with head, back and wings deep chocolate- 
brown, and pure-white wing and tail coverts ; and after the autumn moult, when 
the young birds have gone north to the open ocean away from ice, one sees them 
in this dark plumage during the winter months between New' Zealand and 
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