392 Mr. H. Denny's Sketch of the Natural History 



Anas Boschas. Occasionally. Halifax, Walton Park, Swillington, 

 Killingbeck. 



Querquedula. Rare. River Calder near Copley mill, 1816. 



Crecca. Common. Scarthingwell, Walton Park, Killingbeck. 



Mareca Penelope. Not uncommon. Halifax, Swillington, Walton 



Park, where one hundred were seen feeding together, Jan. 12, 

 1835. 



Oidemia nigra. Rare. Near Selby. 



Fuligula ferina, Marila, cristata. More or less frequent. Swilling- 

 ton, 1838. 



Clangula chrysophthalmos. More or less frequent. Swillington, 1838. 



Mergus Merganser. Occasionally. Arthington, Halifax. 



serratus. Rare. Swillington, Jan. 24, 1838. 



albellus. Rare. Gledhow, Swillington, 1838. 



Podiceps cristatus. Occasionally. Swillington, Jan. 1838, Halifax. 



rubricollis. Rare. Near Ripponden in the winter of 1800. 



— ^ minor. Not uncommon. Halifax, Killingbeck, Swilling- 

 ton, Walton. 



Colymbus septentrionalis. Rare. Harehills Lane near Leeds, Jan. 

 1829, River Ayr, 1838. 



Phalacrocorax Carbo. Rare. Walton Park, Bramham Park. 



SulaBassana. Rare. Roth well Haigh, Kirkstall, April 1834, Hard- 

 hambeck and Ilkley, winter of 1838, after the second moult. 



Sterna Hirundo. Rare. Knostrop, 1833. 



Larus tridactylus, canus. Occasionally. Walton, Cawood, and 



Selby. 

 fuscus. Rare. Knostrop, 1840. 



Procellaria pelagica. Very rare. Halifax, Rippon. 



Leachii. Very rare. Skircoats Moor near Halifax, 1833. 



Reptilia. 

 The Reptiles occurring in this district are those which are pretty 

 generally spread in most localities, and may be briefly enumerated as 

 follows : 



Lacerta agilis. Natrix torquata. Triton palustris. 

 Anguis fragilis. Vipera communis. punctatus. 



Rana temporaria. 



Bufo vulgaris. 



Pisces. 

 Of the last class of vertebrata we are necessarily circumscribed as 

 to species, in consequence of the geographical jiosition of this portion 



