BLACK GUILLEMOT. 
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nests, if the bare rock upon which the egg is placed can be 
called a nest, and my Aleutian oarsmen were always in a roar 
of laughter when one of these projectiles exploded on the head 
of an unfortunate comrade.” Mr. Trevor Battye informs me 
that in Spitsbergen he saw this Guillemot swimming about 
with the young one on its back. 
Nest. — None, the single egg being laid upon the bare rock. 
Egrg's. — Similar to those of the Common Guillemot, and 
subject to the same variation. Mr. H. J Pearson visited a 
colony on Novaya Zemlya, and obtained a series of eggs in 
July, 1895. He says: — “The series shows great variety in 
colour and size. In colour they closely resemble a selected 
collection of the Common Guillemot’s eggs, and pass from 
pure white to the browns of the Razor-bill, with every variety 
of yellows and blue-greens, some being very handsomely 
blotched with black.” 
THE BLACK GUILLE.MOTS. GENUS CEPPHUS. 
Cepphus, Pallas, Spil. Zool. v. p. 33 (1769). 
Type C. grylk (Linn.). 
The genus Cepphus differs from the genus Uria in its 
shorter bill, the culmen scarcely exceeding the length of the 
inner toe and claw, in the differences of the summer and 
winter plumages, and in the significant fact that it lays a 
couple of eggs instead of one. 
I. THE BLACK GUILLEMOT. CEPBHUS GRYLLE. 
Colymbus grylle, Linn. Spt. Nat. i. p. 220 (1766). 
Uria grylle, Macgill. Brit. B. p. 331 (1852) ; Dresser, B. Eur. 
viii. p. 581, pi. C23 (1877); B. O. U. List. Brit. B. p. 
207 (1883)7 Saunders, ed. Yarrell’s Brit. B. iv. p. 81 
(1884); id. Man. Brit. B. p. 687 (1889); Lilford, Col. 
Fig. Brit. B. part xxiii. (1893). 
Alca grylle, Seebohm, Hist. Brit. B. iii. p. 383 (1885). 
{Plate CV/Jl.) 
Adult Male in Summer Plumage. — Entirely black above and 
below, including the quills and tail; lesser wing-coverts black 
