Py PRODUCTION, 
HE object of the present work is the enumeration of the 
vertebrated animals which are or have been found in 
Yorkshire, and the careful definition of their faunistic position and 
geographical distribution within the county, in language as terse 
and as accurate as it is possible toemploy. Such a work has never 
been undertaken for the county, nor indeed has there been pub- 
lished a list either of the vertebrata as a whole, or of any of the 
classes into which the sub-kingdom is divided. In this respect 
Yorkshire affords a marked contrast with the neighbouring counties 
of Norfolk and of Northumberland and Durham, whose avifaunas 
especially have been written—and more than once—by competent 
and able ornithologists. 
The number of British vertebrata which have not occurred in 
Yorkshire being comparatively small, it seemed desirable to make 
the work not only a county handbook, but a complete nominal 
catalogue of the British species. Such a catalogue is in itself a 
desideratum, especially if brought up to the standard of present 
knowledge, and will be of use both as furnishing a ready means 
of comparison and as facilitating the registering of additions to 
the Yorkshire fauna. Careful attention has been paid to the 
classification and nomenclature, both being based upon the works 
of the most recent and reliable authorities. 
Mammalia.—tThe list of British mammalia here given is 
substantially that of the second edition of Bell’s History of 
British Quadrupeds (1874), with such slight modifications as to 
classification and nomenclature as are necessary to bring it down 
to the present time. The list of Bats is entirely based upon 
Dr. G. E. Dobson’s British Museum Catalogue of Chiroptera, 
