LARGE-BILLED GUILLEMOT. S37 



mandible with the dorsal line slightly curved, the ridge narrow, broader 

 at the base, the sides sloping, the edges sharp and inflected, the tip a little 

 decurved, with a slight notch. Nasal groove broad, feathered ; nostrils 

 at its lower edge, subbasal, lateral, longitudinal, linear, pervious. Lower 

 mandible with the angle medial, narrow, the dorsal line sloping upwards 

 and straight, the back very narrow, the sides nearly flat, the edges sharp 

 and inflected. 



Head large, oblong, depressed, narrowed before. Eyes of moderate 

 size. Neck short and thick. Body stout, rather depressed. Wings 

 small. Feet short, placed far behind ; the greater part of the tibia con- 

 cealed, its lower portion bare ; tarsus short, stout, compressed, anteriorly 

 sharp, and covered with a double row of scutella, the sides with angular 

 scales ; toes of moderate length, the first wanting, the third longest, the 

 fourth longer than the second, all covered above with numerous scutella, 

 webbed, the lateral ones with small margins ; claws small, slightly arched, 

 compressed, rather acute, that of the middle toe largest, with a dilated in- 

 ner edge. 



Plumage dense, very soft, blended ; on the head very short. Wings 

 rather short, narrow, acute ; primary quills curved, tapering, the second 

 longest, the first slightly shorter, the rest rapidly graduated ; secondaries 

 short, incurved, broad, rounded. Tail very short, rounded, of twelve 

 narrow feathers. 



Bill black. Iris dark brown. Feet dusky, tinged with red. The 

 general colour of the plumage is greyish-black on the upper parts, those 

 of the head tinged with brown. The sides of the head and neck, its fore 

 part, the breast, abdomen, edges of the wings and the tips of the secon- 

 daries, white ; the sides shaded with greyish-black ; a line of the same 

 behind the eye. 



Length to end of tail 18^ inches, to end of claws Sl^ ; extent of 

 wings 30 ; wing from flexure 8, tail 2^ ; bill along the ridge 1^%, along 

 the edge of lower mandible 2 ; tarsus 1/j ; middle toe lj*j, its claw /j. 

 Weight 2i lb. 



