478 ALCIDAi 
oblique furrows eight or more in number which meet at 
the edges. 
Fret. Black, short, and placed very far back. 
IripEs. Dark brown. 
AVERAGE MEASUREMENTS. 
TOTAL LENGTH ... ou se. OA in. 
WING us ay ee ey, 
BEAK ee - Bee sdattr a awease 
TARSO-METATARSUS Sele dew. < 
exes as =a ae wae OU OF ane 
DESCRIPTION OF THE GREAT AUK IN THE MUSEUM OF ZOOLOGY, 
DUBLIN UNIVERSITY. 
Prats Jol, Bias: 1,2. Prana Wil higss ae 
Though rather poor in plumage, this specimen is 
particularly interesting, as it claims to be the only known 
mounted example in immature plumage in existence. The 
state of captivity to which the bird was subjected for some 
months prior to its death, was evidently not conducive to 
keeping the plumage in good condition, and it may also be 
remarked that the moulting period was passed through in 
captivity. 
Top of head, dark brown; back and sides of head 
behind the eye, hghter brown; oval patch in front of eye, 
white, mottled with brown; lower part of face, impure 
white, mottled with brown; chin, mottled dark brown and 
white, brown predominating ; middle line of throat, chiefly 
white ; sides of throat, dappled with white and brown, like 
the lower part of the face ; lower throat, breast, abdomen, 
and under tail-coverts, dirty white ; back of neck, mid-back, 
and lower back, brown, the last darker in shade, merging 
into the blackish-brown colour of the rump and upper tail- 
coverts; tail-feathers, brownish, frayed and broken, their 
basal three-fourths only being preserved ; thighs show some 
brown feathers; scapulars and inner secondaries, blackish, 
and only faintly glossed; outer secondaries, brownish, edged 
with white, forming a wing-bar; primaries, light mouse- 
brown, many of them broken, and with frayed edges ; lesser 
wing-coverts, greyish-brown, edged with deeper brown ; 
