218 alcidjEj colymbidvE. 
Family Alcid^e. 
327. Uria troile, Temm. The Common Guillemot. 
This Guillemot is occasionally seen in small numbers 
about the Straits in winter, especially after severe weather 
from the westward. 
328. Alca torda, Linn. The Razor-bill. 
Moorish. Bou-drihima {Favier). 
Favier only says of this species that it "is found near 
Tangier from November to February." 
The Razor-bill, in some winters, appears in the Straits in 
very large numbers, as in the winter of 1871-72, when, 
during February, they were to be seen in all directions about 
Gibraltar Bay, some coming into the New Mole so close to 
the land that we threw stones at them. They lingered on very 
late, as I saw ten on the 19th, one on the 21st, and two on 
the 28th of March, and one on the 7th of April. In this 
case their appearance was, no doubt, attributable in the first 
instance to heavy gales and storms outside the Straits. 
Total length about 17 inches. 
329. Fratercula arctica (Linn.). The PulBfin. 
"This species is found near Tangier from November to 
March, sometimes even lingering as late in the spring as 
April and May. They are more abundant than the Gannet, 
and are frequently picked up dead on the sea-shore after 
stormy weather." — Favier. 
I have seen Puifins in Gibraltar Bay as late as the 5th of 
March ; but as far as my experience goes, they are a much 
less frequent bird than the Gannet and even than the Razor- 
bill {Alca torda). 
Family CoLYMBiDiE. 
330. CoLYMBUS SEPTENTRiONALis, Linn. The Red-tkroated 
Diver. 
This is the only species of Diver which I succeeded in 
