ALGIB^ — PHALERIBIN.E : A UKS. 



805 



pieces; the change in npper inamlilile is decidcil, as in i^. occffca, but the differenro in the 

 lower mandible is comparatively slight. In birds of tlio first spring the terminal portion of the 



bill may be smooth, lilve tlie nndca' mandible, 

 miliou ; at this time tlie face whitens and the 



FlG- 637. — Horn-billed Auk, adult in winter, nat. size. (From Elliott.) 



and tlie bill and feet rather orange-red than ver- 

 crests sprout. Young: Xo crests, and no white 



about the face 

 The bill lilic that 

 of the athdts in 

 Avinter after the 

 nuiult, saddled 

 witlis.ift dark-col- 

 ored skin at 1)ase, 

 but every way 

 smaller, weaker, 

 and quite smooth 

 ( " Safiiitiiforhiiia 

 latJtami," tig. 5S5,) 

 and, lilve the feet, 

 rather yellow or 



orange than red ; tlie plumage entirely blackisli above, sooty-brown below, the feathers of the 

 belly and flanks wliitish at the base ; iris brown. Coasts and Islands of the N. Pacific, S. in 

 winter on tire American side to California ; of casual occurrence on tlie Atlantic Coast to New 

 England. General habits and economy of the ecanmon puffin ; nesting similar. Egg single, 

 rcaigh, dead-white, but showing, besides frefpient discoloratious, oljsolete shell-markings of 

 pale purplish-gray ; size from 2.C5 to 2.S5, by 1.92 to 2.00 ; broader and more capacious than 

 that of i^. corniciihita, though no haiger. 

 339. CERATOKHI'NA. (Gr. Kepas. Ksparos, kerns, 7:ernto.'i, a horn ; pis, pivos, hris, hriiws, tlie 

 nose.) Rmxoc'EKD.s Auks. Related to Xh/k/cj and i^/'«tere»./(:i _; uo peculiarity of eyelids or 

 inner claw; bill smooth ; 

 base of upper mandible 

 with a large upriglit 

 horn, and under mandi- 

 ble with an accessory 

 homy piiece lying l;ic- 

 tween its rami ; this 

 piece and the horn decid- 

 uous, when base of up- 

 per mandible covered 

 with a soft cere. Bill 

 shorter than head, stout, Fio- 538. — Horn-billed Auk, ymmg, nat. size. (From Elliot. ) 



deep at base, much compressed and rapidly tapering to acute decurved tip, sides erect, smooth, 

 culmen very convex, gape gently curved, gonys nearly straight, with angle at symphysis. 

 Nostrils short, linear, subbasal, marginal, impervious, at base of the horn or cere. Two 

 series, postocular and maxillary, of lengthened, straight, stiffish lance-acute white feathers on 

 each side of head. General form of i^rato'C)(?a.' Size large. One species. 

 857. C. monocera'ta. (Gr. /xovos, moiios, only, single ; Kepas, keras, horn. Figs. .536, .537, .538.) 

 Unicorn Auk. Horn-bill Auk. Adults iu summer : Bill orange-yellow. Culmen and 

 base of upper mandible dusky ; feet some yellow color, the tarsi behind and the soles blackish ; 

 claws black. The sharp feathers of the head white, about an iuch.long. Entire upper parts 

 glossy bine-black; a line of white along edge of forearm. Sides of head and neck, of body 

 along under the wings, with chin, throat, and fore-breast, clear grayish-ash, or pale bluish- 



