IV 
lies. At the end of each description is added the country, 
or strata, and other peculiarities of each species mentioned. 
Great attention has been paid to dates, and the generic 
and specific names which appear to possess priority in this 
respect have been adopted. 
Keference has also been made to the works in which the 
genera and species appear to have been first described or 
noticed. 
Mr. S. P. Woodward has kindly assisted in the pre- 
paration of the Catalogue, especially as regards the fossil 
species, and in dravring the illustrations, which have been 
engraved by Miss Ann Waterhouse of the School of 
Design. 
JOHN EDWARD GRAY. 
January 11th, 1853. 
