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. 



Reference 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 drawing the illustrations, which have been 

 engraved by Miss Ann Waterhouse of the School of 

 Design. 



JOHN EDWARD GRAY. 



January 11th, 1853. 



