PROCELLARIUDZ. 55 
parts, forehead, tips of longer 
scapulars and of tail white; wing 
BbOUt Bi00 ss ccewccawess Halobeena 
®. Depth of bill at shallowest part decidedly 
less than one-fourth the length of the 
lower mandible, measured along its side; 
plumage bluish gray above, becoming 
white on forehead and blackish on wings; 
beneath entirely white; wing about 
P00 a cersecoeasaewevenavtssaedeseebae Cookilaria.? 
g’. Partition between nostrils very thick (as wide as or 
wider than nostril), ending anteriorly “flush” 
with, or but little behind, the anterior rim of the 
nasal tubes. 
i’, Space between nasal tubes and base of unguis not 
greater than length of the latter; nostrils not 
visible from above ; color uniform sooty black 
(browner below), with or without white mark- 
ings on head ; wing 13.50 or more.. Majaqueus’ 
i. Space between nasal tubes and base of unguis 
decidedly greater than length of the latter; 
nostrils partly (usually entirely) visible from 
above; color and size very variable, but wing 
never more than 15.00 (usually much less). 
Puffinus. (Page 58.) 
J?. Bill flattened, broader than deep at base. 
Branches of lower mandible bowed widely apart, the 
space between mostly unfeathered ; plumage spotted 
white and dusky above, entirely white beneath. 
Daption. (Page 69.) 
e'. Inner side of edge of upper mandible with distinct fringe-like 
processes ; color bluish above, the tail tipped with black- 
ish; beneath white; wing about 7.00-7.50. 
J’. Culmen concave ; lateral outlines of bill straight. 
Pseudoprion. 
J’. Culmen straight; lateral outlines of bill decidedly convex. 
Prion.’ 
d’, Culmen less than half as long as middle toe, with claw; tail 
even; hind claw very large, equal in length to the nasal tubes, 
measured along the top ; color entirely pure white... Pagodroma.® 
1 Halobena “Is, Georrr. 1836,” Bonar. Consp. ii. 1857, 193. Type, Procellaria cxrulea GMEL. 
% Cookilaria Bonap., Compt. Rend. xliii. 1856, 994. Type, Procellaria cookii Gray. 
8 Majaqueus Reicu., Av. Syst. 1852, p. iv. Type, Procellaria equinoctialis Linn. 
4 Pseudoprion Covuss, Pr. Ac. Nat. Sci. Phil. 1866, 164. Type, Prion turtur Gout. 
5 Prion Lacipipr, Mém. de I’Inst. 1800-1801, 514. Type, Procellaria vittata GMEL. 
6 Pagodroma Bonap., Consp. ii. 1856, 192. Type, Procellaria nivea GMEL. 
