PEEFACE. 
Two years have elapsed since the corapletiou of Part I. of 
Mr. Foord’s Catalogue : during that time he has been almost 
entirely occupied in the preparation of the present volume. 
So anxious has he been to make his work as complete and 
satisfactory as possible, that he has visited the Museums of 
Brussels and Munich, besides very many public and private 
collections in this country, to see cverj’ type which might assist 
him in drawing up his descriptions. Fortunately the number of 
type-specimens in the British Museum is very largo, so that he has 
enjoyed special facilities for study and comparison on the spot, and 
many specimens have been lent to him by other Museums. 
The number both of illustrations and of pages in Part II. are 
larger than in Part I., and the Tables of Genera and of Strati- 
graphical equivalents add much to the usefulness of the present 
volume. From the former Table (A) wo gather that there are 
in the Museum 573 species included in the Naftiloidea, of which 
459 are met with in the Paheozoic rocks/ 93 in the Mesozoic, and 
21 in the Cainozoic strata — the Paloeozoic forms being divided into 
29 genera and 6 subgenera, the Mesozoic into 4 genera and 2 sub- 
genera; in the Cainozoic only 2 genera and I subgenus are met 
with, whilst at the present day Nautilm alone survives* 
