Birds. 1385 



morant, but much lesser," which may be either this species or the 

 greater shearwater, (Puffinus major). 



Wilson's Petrel, Thalassidroma Wilsoni. A specimen is said to 

 have been taken some years since at Salthouse. 



Fork-tailed Petrel, Jlialassidroma Leachii. A fork-tailed petrel 

 was found dead on the beach at Yarmouth in December, 1823. 



Storm Petrel, Thalassidroma pelagica. Occurs generally every 

 autumn or winter in small numbers, and is occasionally very plentiful, 

 for a short time, after severe gales. 



CONCLUDING OBSERVATIONS. 



It must be stated that the preceding Catalogue, although it will ap- 

 ply, with probably only a few trifling exceptions, to the whole district 

 of the eastern counties, has been prepared from observations and 

 notes, chiefly made in the eastern part of Norfolk. 



The total number of birds included in it is 277, of which 81 are 

 residents, and 196 are either regular or occasional migrants ; the large 

 proportion of which latter is sufficiently accounted for by the position 

 and aspect of the district in which they are found. For whilst its 

 easterly situation, and its projection into the German Ocean, afford 

 great facilities for the visits of the migratory species, the great diver- 

 sity of its soil, and the abruptness of the transition from one forma- 

 tion to another, producing a corresponding variety of natural and arti- 

 ficial produce, and a consequent abundance of food and shelter, ren- 

 der it still further attractive both to these and to the resident tribes. 



The coast, although destitute of rocks, possesses almost every other 

 form of beach and cliff, and is in some places bordered by salt marshes ; 

 and the eastern parts of the county are further diversified by large 

 tracts of, in many cases, shallow water, bordered by reeds, and termed 

 te broads." The part called Breydon, which is several times mentioned 

 in the Catalogue, differs from these in being subject to the full influ- 

 ence of the tides, and it consequently presents alternately a (literally) 

 broad sheet of salt water, and an immense extent of mud-banks 

 abounding with the food of the various species of water-birds. It is 

 also surrounded by a large tract of salt and fresh-water marshes. 



We now proceed to add a few observations on the birds contained 

 in the Catalogue, chiefly with reference to the movements of the mi- 

 gratory species, and in order to consider them the more conveniently, 

 we have, as will be seen in the following analysis, divided them into 

 two great classes, viz. residents and migrants, the former of which we 

 iv 5 h 



