370 
ON THE CLASSIFICATION OF BIRDS. 
gonys very short and angulated. Quills internally 
emarginated. T ail none. 
D. poliocephalus. 111. of Orn. L pi. 13. 
PoDOAj Illiger. Bill mo- 
derate : the culmen 
curved towards the tip, 
which is notched. 
W ings moderate, point- 
ed. Tail remarkably 
broad, and rounded. 
Rasorial. (fig. 337-) 
P. Suriuamensis. PI. Col. 893. 
CoLYMBUs, Linn. Diver. Bill rather long, straight ; 
the tips acute ; the margins indexed. Nostrils half 
closed by a membrane. Wings short, pointed. Feet 
with four toes, all connected by a palmated mem- 
brane, which is not lobed. The natatorial type. 
C. glacialls. Selby, pi. 76. 
Family A LOAD.®. Auks.* 
Bill with the culmen more or less arched ; the sides 
compressed. Feet entirely webbed. The hinder toe 
minute, or wanting. 
Ubia, Brisson. Guillemot. Bill moderate, slender. 
Frontal plumes advancing far upon the nostrils, but 
divided by the culmen. Feet slender, three-toed. 
Tenuirostral. 
Troilc. PI. Enl. 903. Brunnicbii. Tem. Man. ii. 926. 
Alca, Linn. Auk. Bill compressed and grooved as 
in the last genus, but longer than broad. Nos- 
trils placed towards the middle of the bill. W ings 
abortive, fin-shaped. 
A. impennis. Selby, pi. 82. 
Mormon, Illiger. Puffins. Bill short, very high ; the 
sides generally sulcated : the culmen strongly arched, 
* The individuals in this group are so few, that I have not considered it 
expedient to adopt tlie auhgenera particularly as their natural series has 
not been worked out. 
