404 TEN YEARS IN SWEDEN. 



of these coasts, but many assemble in the winter off the 

 north-west coast of Norway. Only accidental in the South. 



246. T. LEACHII, Tern. Klystjertad Storm Svala. Leach's 



Petrel. D. 



Like the last, but the wing coverts are brown-grey ; 



length 8 in., and the tail is deeply cloven, 5 1. shorter 



than the wings ; the longest feather in the tail 3 in. ; 



beak, from gape, 7 1. ; nasal tube does not reach half 



way down the beak ; hinder back, rump, and sides white. 



Is said to have been once killed in Norway. 



Wilson's petrel, which is about the size of the last, but 



with a square tail, much shorter than wings, and has an 



oblong yellow patch on each of the webs between the toes, 



has never been identified, nor has Bulwer's petrel, in any 



of these seas. 



Fam. 2. LAMELLIROSTRES, Cuv. 



Beak various ; both mandibles armed with lamellas or with 

 small denticulations ; front toes wholly webbed ; hind toe 

 placed high, not webbed. 



Gen. CygnuSj Bechst. Swans. 



Beak longer than the head ; the nail on the top of its tip 

 does not occupy the whole of the point of the beak ; nostrils 

 pierced through, placed in the middle of the beak ; tract be- 

 tween the beak and the eyes in the old birds naked ; neck 

 thin, as long or longer than the whole body; second and 

 third wing feathers longest. 



The swans differ from the geese in that the beak is longer 

 than the head j sides of the cheek bare ; tarsus shorter than 

 the middle toe, and neck as long as the whole body. The 

 young do not attain their full white plumage till the third 

 year, before which time they are greyish blue. Like the 

 ducks, they are monogamous. 



247. CYGNUS MUSICUS, Bechst. Sang Svan. The Wild 



Swan. D. F. 



The whole of the body colour white ; bill black, 

 longer than the head, bright yellow at the base and 



