FRATERCULA. 11 
Genus FRATERCULA Brisson. (Page 8, pl. IIL, fig. 2.) 
Species. 
Common Cuaracrers.—Upper parts, together with a band across fore-neck, 
uniform blackish ; sides of head grayish or white; lower parts pure white. Downy 
young, uniform sooty blackish, or dark sooty slate, the belly white. Egg shaped and 
colored like that of Lunda cirrhata. 
a’. Grooves of the bill very oblique, broad, and distinct, the deciduous basal shields 
occupying less than the basal half of the bill. Nuptial plumage: Chin and 
whole throat grayish, the sides of the head gray; horny process on upper 
eyelid short, subconical; length 11.50-13.75. 
bY. Bill and general size smaller: Culmen 1.60-1.90, gonys 1.40-1.50, depth of 
upper mandible at base .75-.90, of lower, .40-.50. Egg 2.46-1.74. Hab. 
Coasts of the North Atlantic, from southern Greenland south, in winter, 
in North America, to New Jersey, breeding as far south as the Bay 
GU BTA isectenineeteamirnnnsy nicest sa. neninaanlette 13. F. arctica (Linn.). Puffin. 
6%. Bill and general size larger: Culmen 2.00-2.30, gonys 1.40-1.60, depth of 
upper mandible at base .85-1.00, of lower, .70.-80. Egg 2.65-1.82. Hab. 
Coasts and islands of the Arctic Ocean, from Spitzbergen to northern 
and western Greenland. 
13a. F. arctica glacialis (Trmm.). Large-billed Puffin. 
a’. Grooves of the bill nearly vertical, narrow, and rather indistinct; deciduous 
basal shields occupying much more than the basal half of the bill. Nuptial 
plumage : Whole throat blackish, the chin, only, gray; sides of head white; 
horny process on upper eyelid elongated, horn-like. Downy young: Uniform 
sooty blackish, the belly, abruptly, white. Length about 12.50-14.00; culmen 
2.00-2.25, gonys 1.60-1.70, depth of upper mandible 1.15-1.25, of lower, .70- 
80. gg 2.74-1.84. Hab. Coasts and islands of the North Pacific, from 
British Columbia to the Kurile Islands. 
14. F. corniculata (Naum.). Horned Puffin. 
Genus CERORHINCA Bonaparte. (Page 9, pl. IV., fig. 1.) 
Species. 
Bill much compressed, longer than deep, the culmen regularly curved, but 
gonys nearly straight; upper parts uniform dusky; under portion and sides of 
head and neck, down to the chest, together with sides, smoky plumbeous; rest of 
lower parts white, usually clouded with smoky gray; a row of narrow, pointed, 
white feathers along each side of occiput, commencing just above and behind the 
eye; another row of similar but larger feathers across cheeks, from near corner of 
mouth. Wuptial plumage: Base of upper mandible surmounted by a compressed 
upright horn, the base of which clasps the mandible as a saddle, down to, and en- 
closing the nostrils. Winter plumage: Similar to nuptial dress, but breast more 
