Birds of the Weddell and adjacent Seas. 335 
during the voyages of the expedition. A number of speci- 
mens were obtained in the month of March during the 
Antarctic voyages of 1903 and 1904, and these vary in their 
plumage. Some are more or less faded (drab) in colour and 
abraded in feather, and are, no doubt, unmoulted birds : 
others are evidently freshly moulted adults or young of the 
year ; in these the head, back, scapulars, lesser wing-coverts, 
quills, aud tip of the tail are slaty black, and the under 
parts purer white. Specimens in moult are intermediate 
between these two forms, and make clear the relationships 
of these phases in plumage as regards adult birds. Some 
of these moulting birds lack rectrices, their tails being 
represented by the long under tail-coverts enly. The fect 
in life have the tarsus and outer toe greyish, the other toes 
and the webs paler and washed with yellow. 
PRIOCELLA GLACIALOIDES (Smith). 
Priocella glacialoides Cat. Birds, xxv. p. 393. 
The Silver or Silver-grey Petrel was observed during the 
voyages to and from the Weddell Sea, between the latitudes 
44° 30! and 71° 22’ 8., and the meridians of 9° 43’ and 
42° 30' W. The extreme southerly range here indicated 
has only been exceeded, I believe, in the case of the 
observations made by Dr. Wilson during the National 
Expedition under Capt. Scott, when the bird was seen in 
the Ross Sea (Voy. of the ‘ Discovery,’ ii. p. 481). 
This Petrel was first met with on the 9th of February, 
when the ‘ Scotia’ was skirting the pack-ice in 58° 57'S, and 
33° 34! W., or about midway between the South Orkney and 
South Sandwich Groups ; but it was not observed beyond 
63° 54’ S. on the 1903 voyage. On the second voyage it was 
noted as high as 71° 22/8., on March 18th, 1904, when 
one was seen 1n company with several other species of Petrel 
and Arctic Terns. 
It does not appear to be an abundant species in the Weddell 
Sea; but it was observed in numbers during the northward 
voyage, when latitude 60°S. was reached, and was last seen 
when the ‘ Scotia’ was nearing Gough Island. 
