574 



8 



extended, and evidently used to propel it. Its movements are quick and easy, and it turns and 

 twists about with great celerity and grace. I observed when watching these birds that they 

 evidently had some trouble to keep themselves at the bottom of the tank ; for when they picked 

 any thing up from the ground they used a good deal of exertion to avoid rising up, and in so 

 doing emitted a stream of pearl-like silvery bubbles. I ascertained, by timing them, that they 

 remained below the surface about thirty to thirty-five seconds. 



The specimens figured are an adult in winter and an old male in summer dress, the latter of 

 the variety usually known as the Ringed or Bridled Guillemot. 



In the preparation of the above article I have examined the following specimens : — 



E Mus. H. E. Dresser. 



a, d ad. Flamborough, Yorkshire, June, b, ad., var. ringvia. Orkney (Dunn), c, ad., d, jun. Leadenliall 

 Market, November 9th, 1871. e,f,pull. Lundy Island, July 1872 (H. Saunders). 



E Mus. H. Burton. 



a, b, c, d, e, f. English coast, summer dress, g, h, i, j, k, I, m, n, o, p. English coast, winter dress, q, r, s, t. Near 

 Brighton, winter (E. Booth). 



