TO 



Sir JOHN LUBBOCK, Bart., M.R, 



D.C.L., LL.D., F.R.S., &c., 



AS 



President of the British Association, 



ON THE OCCASION OF 



Its meeting in the City and County of its Origin, 



to celebrate the completion of 



The First Fifty Years of its Existence, 



This contribution to the Natural History of the County 



is dedicated. 



