Velvet Duck, 
UNDER TAIL COVERTS. — Those feathers immediately cover- 
ing- the base of the tail beneath. 
UNDER WING COVERTS. — Those feathers covering the wing 
underneath. 
UPPER TAIL COVERTS. — Those feathers immediately covering 
the base of the tail feathers. 
UPUPA (LiNN,ffius.) — * Hoopoe, a genus thus characterised. Bill 
long, compressed, awl-shaped, and curved ; nostrils at the base ovate 
and open ; legs, with the shank short, three toes before, and one 
behind; the outer toe joined to the middle one, as far as the first joint; 
claws short, and not much hooked ; tail composed of ten feathers, 
square at the end ; wings having the first quill short, and the fourth 
and fifth the longest,* 
URIA (Brisson.) — ^Guillemot, a genus thus characterised. Bill 
middle-sized or short, straight, pointed, compressed ; the upper man- 
dible slightly curved towards the point ; the under forming an angle 
more or less open ; nostrils at the sides of the base concave, slit length- 
wise, one half hid by a broad membrane, clothed with feathers, and 
pierced from part to part ; legs short, placed back upon the belly beyond 
the balance of the body ; shanks slender ; only three toes, placed 
