iv 



NOTICE. 



classes of animals and plants the remains of which are contained in 

 British rocks ; to select especially such as require an amount of illus- 

 tration which, to be carried out by private enterprise, would require 

 a large outlay of money, with little prospect of a return, and a long 

 time to accomplish, but which, by means of the staff and appliances 

 necessarily employed on the Geological Survey, can be effected at small 

 cost, and with a rapidity demanded by the publication of the Maps and 

 Memoirs of the Survey ; thus, it is hoped, affording an aid to those 

 engaged in the sciences with which this Work is connected, that they 

 might not otherwise have possessed, and which may materially promote 

 the progress of individual research. 



H. T. De la Beche, 



Director- General. 



Geological Survey Office, 

 im July, 1849. 



