ALCIDM — PHALEIUDINM: AUKLETS, ETC. 1069 



CERATORHI'NA. (Gr. xepaj, Keparos, kcms, keratos, a horn ; pis, pivos, Jiris, hrinos, the 

 nose. The name of this genus was first Cerorhinca Bp. 1828, thus mangled beyond certain 

 recognition, for the second element in its malformation might have been pvy^os, hrugchos, beak. 

 But the author next wrote Ceratorrhina, in 1830 aud 1831, showing that he intended the ety- 

 mology I have given. This became Cerorhina Bkandt, 1837. Then came Ceratorhyncha 

 and Cerorhynca Bp. 1838. Later forms are Ceratorhyncha, Ceratorhina, Cerorhyncha, Cero- 

 rhincha, Cerorhyna, etc. I hold to the form given in the Key, 1884, aud later. A. 0. U. 

 uses the original abortion.) Ehinoceros Auklet. Eelated to Lunda and Fratercula; no 

 peculiarity of eyelids or inner claw; bill smooth ; base of upper mandible with a large upright 

 horn, and under mandible with an accessory horny piece lying between its rami ; this piece and 

 the horn deciduous, when base of upper mandible covered with a soft cere. Bill shorter than 

 liead, stout, deep at base, much compressed and rapidly tapering to acute decurved tip; sides 

 smooth ; culmen very convex ; gape gently curved ; gonys nearly straight, with angle at sym- 

 physis. 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 feath- 

 ers on each side of head. Tail of 16 Crarely 18) feathers. General form of Fratercula and 

 Lunda. Size large for this subfamily. One species. 



C. monocera'ta. (Gr. povos, monos, only, single; Kepas, keras, horn. Figs. 722, 723,724.) 

 Unicokn Auklet. Horn-hill Auklet. Adult (J 9 >i" summer: Bill orange ; culmen and 

 base of upper mandible dusky ; feet some yellowish color, tarsi behind and soles blackish ; claws 

 black. Iris amber. Sharp plumes of head white, about 1 .00 long. Entire upper parts dusky ; 

 a line of white along edge of forearm. Sides of head and neck, of body under wings, with 

 chin, throat, and fore-breast, clear grayish-ash, or bluish-gray ; under parts from breast pure 

 white, shading insensibly into color of sides and flanks. Inner webs of wing- and tail-feathers 

 grayish-brown, paler toward base; shafts of primaries dull whitish at base. Length 14.00- 

 1.5.50; extent 26.00; wing 7.25; tail 2.50; tarsus 1.20; middle toe and claw 1.85; outer 1.70; 

 inner 1.40; chord of culmen without horn 1.00, with horn 1.40; gape 2.00; nostril to tip of 

 horn 0.75; total depth of bill, including horn, 1.25. In winter: Plumage similar; iris white; 

 no horn nor accessory piece under bill, these being shed ; place of horn occupied by a soft 

 ilark-colored basement membrane or cere Q^ Sagmatorhina suckleyi," fig. 723). Young: Bill 

 like that of adults in winter, lacking horn, but hardly more than half as large. Plumage 

 mostly dark; no white plumes on side of head; white of under parts overlaid and marbled 

 with dark-gray ends of the feathers ; black of upper parts brownish. The first spring. the horn 

 grows, the accessory piece develops, and the plumage clears up. Nestlings are covered with 

 smoky-brown down resembling those of Lunda cirrata both in size and color. Egg single, 

 colorless or nearly so, but more or less obscurely marked, as in Lunda and Fratercula ; size 

 2.70 X 1.80. Both coasts and islands of North Pacific to Lower California aud Japan; not 

 specially Arctic ; has bred as far S. as the Farallone Lslands. 



CYCLORRHYN'CHUS. (Gr. kvkKos, kuklos, circle, and pvyxoi, hrugchos, beak. PuG-NOSED 

 AlKLET. Bill moderately large, much compressed, densely feathered at ba.se, but not to 

 nostrils, which are narrowly oval, overhung by a deciduous scale or shield. Profile of bill 

 oval; of u))per mandible narrowly oval; culmen gently convex, declinate, tomial edge more 

 convex, acclinate, meeting at an obtuse tip ; lower mandible extremely slender, falcate, re- 

 curved, with concave toinia, very convex gonys, and acute point. Frontal feathers embracing 

 culmen with a re-entrance, thence dropping |)erpendicularly to commissure ; those on lower 

 mandible not reaching (juite so far; iuicrramal space fully feathered. Wings ami tail as in 

 Simorhynchus ; tail 14-feathen'd ; tarsus shorter than middle toe, reticulate. As subgenus of 

 Simorhynchus, in previous editions of the Key, but I said, ]>. 806, tluit it ''migiit stand apart 

 as a genus," and as the A. (). U. committee has acted on this suggestion, 1 willingly accord it 

 full generic rank. 



