10 | R. COLLETT. [No. 1. 
there is nothing to prevent the size from corresponding in re- 
ality with that of U. grylle. 
According to Bittikofer's opinion, the specimen at Leyden is 
,somewhat larger than our numerous specimens of Uria grylle, 
the wing measuring 16.5 cm.* No other measurements are given. 
As I have on several occasions shown), I have repeatedly 
examined normal specimens of Uria grylle on the coast of Nor- 
way, of which the length of wing has exceeded 16.5 centim. 
(between 166 og 172 millim.). Steineger has also measured 
specimens whose length of wing has been over 165 mm.*) 
According to Dr. O. Grant, the specimen in London is 
»considerably smaller than U, grylle, the wing being 6.5 inches 
(about 164 mm.), tail 1.11 inches (48 mm.)*. 
As in this respect the Norwegian specimen exhibits no dif- 
ference from the normal U. grylle, we may perhaps presume, 
that the 3 existing specimens in reality scarcely vary in size 
from U. grylle, though perhaps they may reciprocally present 
some slight difference. 
Concerning the Size and Shape of the Bill in the original 
specimen, we find no thoroughly satisfactory description. Benicken 
gives the following measurements for the type-specimen (1. c. 
p. 888): 
Långe des Schnabels von d. Stirn, 1 Zoll, 9 Lin. (about 45 mm.) 
Å Nå » Vom Mundwinkel, 2 , 3 , (Fsnmn) 
2 - » Vond. Nasenlöch, 1 , - , (Em 
The first of these measurements (from the forehead) can 
scarcely, as Stejneger (1. c. p. 215) supposes, be transferred as 
a matter of course ,to the exposed culmen*, whereby the bill 
would be not a little larger than that of the normal U. grylle, 
as nothing direct is expressed about it. Had only å few feathers 
been missing at the root of the bill, the length would im- 
mediately have become greater than the actual length of the 
culmen. 
pt 
1) Nyt Mag. f.Naturv. Vol. 23, p. 140; Vol. 26, p. 393; and Vol. 35, p. 345. 
2) Proc. U. S. Nat. Mus. 1884, p. 222. 
