32 A MANUAL OF THE BIRDS OF AUSTRALIA. 
grey; throat and under-surface of the body white; the long under tail-coverts 
ash-brown with pale edges ; axillaries and under wing-coverts also ash-brown, some 
of the latter have pale edges ; bill perfectly black on the ridge, changing to horn 
colour on the hook and having a black line down the middle of the lower mandible, 
widening out on meeting the unguis, which is dull horn colour, remainder of bill 
yellow ; legs and feet greyish-flesh colour, shaded with dark on the heel and on the 
outer sides of the tarsus and toes ; interdigital webs yellowish with grey edges, 
iris dark brown. Total length 425 mm.; culmen (exp.) 45, wing 335, tail 112, 
tarsus 55. 
Adult female—Similar to adult male. 
Nest.—Cup-shaped structure, in a large chamber at the end of a burrow. 
Egg.—Clutch, one ; pure white ; axis 70 mm., diameter 50. 
Breeding-season.—October to December. (Macquarie Island.) 
Distribution and forms.—Round the Antarctic Circle, and at present no well- 
defined subspecies can be determined. 
Genus PRIOCELLA. 
Priocella Hombron et Jacquinot, Comptes Rendus Acad. Sci. Paris, Vol. XVIII., p. 357, 
March 4th, 1844. Type (by monotypy): P. garnotit Hombron et Jacquinot = Fulmarus 
antarcticus Stephens, 
Accurately this genus would rank as a subgenus of Fulmarus, with which genus 
it agrees in detail save in the bill formation. The bill has long nasal tubes, lying on 
top of the culmen and developed in that position, thus differing from the preceding 
in a character probably of family value. The wing is long and the first primary 
longest. The tail consists of fourteen feathers, and is rounded and more than one- 
third the length of the wing and nearly three times the length of the tarsus. The 
tarsus is weak and not strongly laterally compressed, and much longer than the 
culmen. 
Coloration blue-grey above, white below. 
22. Priocella antarctica. SILVER-GREY PETREL. 
Gould, Vol. VIL., pl. 48 (pt. xxxv.), Dec. Ist, 1848. Mathews, Vol. IL., pt. 2, pl. 82, July 
31st, 1912. 
Fulmarus antarcticus Stephens, in Shaw’s Gen. Zool., Vol. XIII., pt. 1., p. 236, Feb. 18th, 
1826: Cape Seas. 
Procellaria glacialotdes Smith, Ilus. Zool. 8S. Africa, pl. 51, July, 1840: Cape Seas. 
Priocella garnotiti Hombron et Jacquinot, Comptes Rendus Acad. Sci. (Paris), Vol. XVIIL., 
p- 357, March 4th, 1844: Nomen nudum. 
Thalassoica polaris Bonaparte, Consp. Gen. Av., Vol. II., p. 192, 1857 (after Oct. Ist): Nom. 
nud. 
Procellaria smithi Schlegel, Mus. Pays-Bas, Vol. VI., Procell., p. 22, July 1863. New name 
for P. qlacialoides Smith. 
Priocella antarctica addenda Mathews, Austral Av. Rec., Vol. II., pt. 7, p. 125, Jan. 28th, 
1915: New Zealand Seas. 
DisTRIBUTION.—East Australian Seas. Two specimens in Melbourne Museum, collected 
at Queenscliff in December 1882. 
Adult male-—Upper-surface, including the mantle, back, wings, and tail blue- 
grey, becoming paler and inclining to white on the hind-neck ; bastard-wing dark 
grey, some of the feathers white on the inner webs; primary-coverts dark grey 
with pale tips ; primary-quills dark grey with whitish tips, the greater portion of 
the inner webs white, inner primaries paler grey towards the base ; secondaries grey 
on the outer webs and white on the inner ones, the innermost secondaries like the 
back ; middle tail-feathers like the back ; the outer ones white on the inner webs, 
