COMMON AND BRUNNICH^S GUILLEMOTS. 



399 



It is not known that tlie forms recognized asBrunnicli's Guillemot, Pallas's 

 Guillemot, or the Calirorniau Guillemot ever possess either the white ring 

 or the white line behind the eye. The eggs of the Ringed (juillemot are 

 not distinguishable from those of tiie common form, and are subject to the 

 same variations. 



Brunnich^s Guillemot only differs from the ct)nim()n bird in the shape of 

 the bill, and in having the base of the iii)per mandible pale horn-colour, a 

 jjeculiarity also found in Pallas's Guillemot. It is a very rare straggler 

 to the British Islands during autumn and Avinter. It has been most 

 frequently observed in the Orkneys and extreme north of Scotland, but 

 there can be little doubt that it is often overlooked and confused with its 

 smaller-billed ally. 



