201 
The author begs to preface the following Cata- 
logue of Testaceological Writers, by an acknow- 
ledgment of his being indebted for the substance 
of it to a paper in vol. vii. of the Linnaean Trans- 
actions, by Dr. Maton and the Rev. Mr. Rackett. 
It is so perfect a compendium of the subject, that 
he trusts he need offer no apology for wishing to 
render it more generally useful, by putting it into 
a form which is capable of wider dissemination 
than the work in which it is at present extant. In 
altering the arrangement from a chronological into 
an alphabetical one, he by no means wishes to 
imply that he considers the former method excep- 
tionable, but only less adapted to an elementary 
treatise, intended rather for the horn-book of 
learners, than for the information of the scientific. 
The numerals which are placed after the name 
of the conchological author refer to the nature of 
the work, the title of which is given immediately 
afterwards in Italics. By these numerals will be 
designated the branch of science which each writer 
has pursued ; and by comparing them with the 
annexed arrangement, it will be known at once 
