58 NORTH AMERICAN BIRDS. 
Egg 2.83 X 1.91. Hab. Bering’s Sea and portions of the North Pa- 
ClACisecec0e. 86c. F. glacialis rodgersii (Cass.). Rodgers’s Fulmar. 
a. Bill long and slender, its greatest depth much less than half the total length 
(measured from frontal feathers); nasal tubes separated from the unguis by 
a space measuring much more than half as much in length as the former. 
b'. Bill cylindrical at base, or measuring as much in width as in depth ; space 
between nasal tube and base of unguis about equal to the length of the 
former; upper parts plain; head white; tail-feathers 14. (Subgenus 
Priocella Hompr. & JAcq.). 
Head, neck, and lower parts white; upper parts pale pearl-gray, the 
quills darker, with inner webs chiefly white; length 18.00-18.50, 
wing 13.00, culmen 1.75-2.10, depth of bill at base .65. Hab. South- 
ern seas, north along Pacific coast of America to coast of Washing- 
ton Territory... 87. F. glacialoides (Suir). Slender-billed Fulmar. 
b*, Bill compressed, or higher than broad, at base; space between nasal tube 
and base of unguis less than the length of the former; upper parts parti- 
colored; head dusky; tail-feathers 12. (Subgenus Thalassoica Retcu.’) 
Head and neck sooty grayish, darker on top; back, scapulars, rump, 
tip of tail, primary-coverts, lesser wing-coverts, and greater part of 
primaries, sooty slate ; lower parts, secondaries, greater wing-coverts, 
inner webs of primaries, tail (except terminal band), and upper tail- 
coverts, white; wing 12.50, culmen 1.40. Hab. Antarctic seas. 
F. antarcticus (GMEL.). Antarctic Fulmar.? 
Genus PUFFINUS Brisson. (Page 55, pl. XVI, figs. 3, 4.) 
Species. 
a}, Nostrils only partially visible from above, the nasal tubes elevated and inflated 
anteriorly, where broader than at base; under wing-coverts dusky, and 
lower parts white. (Subgenus Priofinus Homprr. & Jaca.) 
b. Above ash-gray, more or less tinged with brown, darker on top of head, 
quills, and tail-feather; lower parts white, except under wing-coverts 
and under tail-coverts, which are deep smoky grayish; bill light yel- 
lowish, with deep black culmen and nasal tubes, the side of lower man- 
dible also mostly black; wing 12.25-13.50, culmen 1.75-1.85, depth of 
bill in front of nostril .50-.55, tarsus 2.25-2.30, middle toe, with claw, 
2.90. Hab. South Pacific, north, casually, to coast of California. 
97. P. cinereus (GMEL.). Black-tailed Shearwater. 
b%. Above brown, the upper tail-coverts tipped with white; wings and tail 
blackish; lower parts white, including under wing-coverts and _ tail- 
coverts; bill yellowish, passing into dusky at tip; wing 15.00, tarsus 
2.35, middle toe, with claw, 3.15. Hab. Antarctic seas. 
P. gelidus (GMEL.). Ice Petrel. 
1 Thalassoica Retcu., Syst. Av. 1852, p. iv. Type, Procellaria antarctica GMEL. 
2 Procellaria antarctica Gwz., 8. N. i. pt. ii. 1788, 565, Thallasoica antarctica Reicu., Syst. Av. 1852, p. iv. 
3 Procellaria gelida GmEL., 8. N. i. 1788, 564, 
