ALCID/E — THE AUKS — CERORIIYNCIIUA. 



521 



sides smoky plumbeous ; lower parts white, usually faintly clouded with smoky gray. A row of 

 straight white lilamentous feathers along each side of the occiput, originating just behind and al>ove 

 the eye ; another row of similar but larger feathers across the cheeks, from the rictus back. liill 

 dull orange, the culmen, with anterior and posterior edges of the horv, black ; legs and feet pale 



Summer adult. 



yellowish brown (in skin), the webs and claws dusky ; iris hazel (W. A. Cooper, MS.). Adult, 

 in winter (= " Ccrrohina SucJdeyi," Cass., " Sagmatorhina Suckleyi," CouEs) ; Exactly like the sum- 

 mer plumage, but breast more uniformly smoky gray, the abdomen more uniform white ; hom-like 

 process of the nasal shield and mandibular process entirely absent. Young, first i^lumage : Similar 

 to the adult, but white filamentous feathers of the head entirely absent, maxilloiy horn wanting 



\. ^ 





Winter adult. 



or imperfectly developed, the bill smaller and of a dusky brown color. Downy young: Uniform 

 sooty grayish brown, lighter than the corresponding stage oi Lunda cirrhata, and with slenderer 

 bill, but otherwise very similar. 



Total length, about 14.00-15.50 inches ; wing, 7.25 ; culmen, from cere or anterior edge of horn, 

 1.00 ; height of horn from nostril, .75 ; tarsus, 1.10-1.20 ; middle toe, with daw, 1.^0-1.5)0. 



The Horn-billod Guillemot, once sujiposed to be a very rare species, has been 

 found by recent explorations to be (piite common, not only on our western coast, 



VOL. II. — OG 



