ALCIDA, — CXXVI. 217 
b. Eyelids with deciduous appendages; no crests; culmen with one curve; 
covering of bill moulted in 7 to 9 pieces. . . . FRATERCULA, 822. 
aa. Inner claw similar in size and form to the others; no rosette at corner of 
mouth. 
b. Bill not very short, the angle of chin much uearer nostril than tip of bill. 
ce. Nostril exposed, overhung by « horny scale (Phalerine); culmen 
straight till near tip, then abruptly decurved. . CErPpPHus, 323. 
cc. Nostril more or less completely concealed by dense velvety feathers. 
(Alcine.) 
d. Bill narrow; neither mandible one tail rounded, the feathers 
not pointed, oo a eS . . . « Upta, 324. 
dd. Bill very deep, much compressed, one or “both mandibles grooved 
in adult; tail graduated, its feathers pointed. 
-  @. Wings well developed; pill (less than 1}) much shorter than head. 
ALCA, 325. 
ee. Wings rudimentary, incapable of nee bill as long as head 
(about 3). . . . - « Puaurus, 326. 
6b. Bill very short and broad, the anale ‘of chin nearer to tip of bill than to 
nostril; culmen curved. (Alling). . . . +» « + « ALLE, 327. 
322. FRATERCULA Brisson. (Lat., fraterculus, little brother.) 
634. F. arctica (L.). Purrin. Grooves of bill oblique, broad 
and distinct. Blackish above; a black band across fore-neck ; 
white below. L.13. B.1%. Arctic, S. to N. J. 
323. CEPPHUS Pallas. (xemgos, a kind of petrel.) 
w. Greater wing-coverts white to their extreme base. 
635. C. mandti (Lichtenstein. ) Blackish, with large white wing- 
patch; nearly white in winter. L. 13. W.7. B.1. Arctic, s. 
toN.J. (Eu) 
aa, Greater wing-coverts with at least their basal half black. 
636. C. grylle (L.). Buack GuiLtemor. Bill larger than in 
C. mandti; size and colors similar. Arctic, S. to N.J. (Eu.) 
(Scandinavian name.) 
324. URIA Brisson. (odpia, a water-bird.) 
u. Depth of bill at angle of mouth less than § culmen. 
637. U. troile (L.). Murre. Gurttemot. Dusky ; second- 
aries white-tipped; basal part of upper tomium dusky. L. 17. 
W.8. B.1%. N. Atl, S.to Mass. (Zu.) (“Possibly to Troil, 
the Icelander.”’) 
aa. Depth of bill at angle more than $ culmen. 
638. U. lomvia (L.). Tsicx-s1Ltep Murre. Dusky; sec- 
ondaries white-tipped ; basal part of upper tomium thickened and 
light-colored in adult. L.16. W. 8}. B.1}. Arctic,S.to N.J. 
(Eu. ) (Swedish name.) 
325. ALCA Linneus. (Lat., from alk or auk.) 
639, A. torda L. Razor-BiLLED Auk. Black; lower parts 
and tips of secondaries white; snuffy-brown in summer. L, 16}. 
