Class II. PUFFIN AUK. 153 



are one inch and three quarters long; and the 

 base of the upper mandible one inch broad; but 

 in the birds from the Isle of Man these propor- 

 tions are much less. * The nostrils are very long 

 and narrow ; commence at the above-mentioned 

 rim, terminate at the first groove, and run pa- 

 rallel with the lower edge of the bill. Theirides . 

 are grey, and the edges of the eye-lids of a fine 

 crimson ; on the upper eye-lid is a singular cal- 

 lous substance, grey, and of a triangular form ; 

 on the lower is another of an oblong form; the 

 crown of the head, the whole upper part of the 

 body, tail, and covert feathers of the wings, are 

 black, but in some the feathers of the back are 

 tinged with brown; the quil feathers are of a 

 dusky hue. The cheeks are white, and so full iaaTrkAl! 

 of feathers as to make the head appear very 

 large and almost round ; the chin is of the same 

 color, bounded on each side by a broad bed of 

 grey ; from the corner of each eye is a small 

 separation of the feathers terminating at the back 

 of the head. The neck is encircled with a broad 



* The form, and the color of the bill varies according to the 

 "age of the bird. These changes are distinctly noticed in Mr. 

 Pennant's Tour in Wales, vol. iii. 40, and in the plate which 

 accompanies it. The observations together with specimens of 

 the bills of this, and the Auk, were communicated by the reve- ' 

 rend Hu^li Davies. Eo. 



