8 R. COLLETT. [No. 1. 
Its behaviour struck the hunter as otherwise than that of 
the other birds. ,It did not show its fear, when the boat ap- 
proached, by raising its head, but it resembled more Alca torda; 
its movements were slower, and it raised its tail higher before 
it dived*. 
The specimen of the same form which was observed on 
Fredö, not far from Christiansund at the end of February, 1892, 
was in company with 3 normal U. grylle, which had begun to 
assume their summer garb (the lower parts variegated). 
This one was also very shy, and was said to have had the 
same slow manner of diving: it may possibly have been the 
same specimen. 
The specimen sent to the University Museum proved to be 
a female. In its stomach, I found portions of Crustaceans (Gala- 
thea squamosa). 

In order to obtain certain information concerning the two 
specimens of this form hitherto preserved, I applied to Dr. Biit- 
tikofer in Leyden, and Dr. Ogilvie Grant at the British Museum, 
who have both, with great readiness, answered the questions I 
put to them. 
It would be extremely interesting, if the typical specimen 
of U. motefeldi, Benicken (U. umicolor, Faber) were still in 
existence. 
Concerning the specimen preserved in the Leyden Museum, 
Prof. Schlegel stated in 1844 (,Revue Critique des Oiseaux 
d'Europe*, p. 106, Leide, Leipzick and Paris): 
» (123) Uria unicolor, Faber, Isis, 1824, p. 981, ne parait 
former qu” une variété accidentelle de I Uria grylle. Nous venons 
d'en recevoir un individu du Groénland*. 
And later, in 1867, in his ,Muséum d' Hist. Nat. des Pays- 
Bas", Tome VI, Urinatores, p. 20 (1867): 
Jo 
