ALCID^, AUKS. GEN. 320, 321. 



341 



(c^-0 



pL 66. See Brandt, I. c. 244). Length 15-16; wing 7J-8 ; tail 2; 

 tarsus IJ ; bill 2 J, nearly 2 deep. N. Pacific, abundant; S. to Gala, in 

 winter ; rare or casual on the 

 Atlantic (Maine, Aud.). Mor- 

 mon cirrliatus Nutt., ii, 539; 

 Aud., vii, 234, pi. 462 ; Cass. 

 inBD.,902. . . cieehata. 



320. Genus CERATORHINA 

 Bonaparte. 



Horn-hilled Auh. Glossy 

 blackish, below ashy-gray, 

 breast and belly white. Adult 

 with two series of stiiEsh lan- 

 ceolate white feathers on each ^'<'- ^l'- undeveloped tin of very young Tufted Puan. 



side of the head, aud a stout upright horn at base of culmen ; immature 

 birds without these lateral crests, and with soft membrane, more or less 

 bulging, in place of the horn ; some specimens ( 9 ?) in perfect plumage 

 have no trace of a horn (C sucJdeyi Cass, in Bd., 906; Saginaiorrldna 

 sucMeyi Coues, I. c. 32 ; see Elliot, Tntrod. No. 102, with figs. ; Brandt, 



Figs. 218-21. Various stages of the bill of Horn-billed Auk. 



I.e. 239. Figs. 218-21 show several conditions). Length 15 J; wing 7^ ; 

 tail 2J ; tarsus 1^ ; bill 1^, including horn ; nostril to top of horn sometimes 

 f . Pacific Coast to Cala. ; breeds S. to the Farallones. Uria occidentalis 

 Aud., vii, 264, pi. 471; Nutt., ii, 538; Cerorhina monocerata Cass, in 

 Bd., 905; Ceratorhyncha monocerata Coues, I. c. 28. . . monocerata. 



321. Genus PHALERIS Temminek. 



C? 2-/ Parr oquet Auh. Bill smooth; upper mandible oval, under falcate, rictus 

 recurved. Blackish, below paler, gray, white, or varied ; adult with a 

 series of filamentous white feathers behind each eye ; bill red, yellow-tipped. 



