INTRODUCTION. 
iv 
Under each species there have been appended all the names under 
" hich the animal or coral has been mentioned since the establishment 
ox the Linntean system of nomenclature, and references are given to the 
works in which these were first used, and especially to the different 
" or ' is treating on British animals in which they are mentioned, and also 
a reference to the best figures. 
The chief part of these references have been extracted from the ad- 
mirable and classical works of Dr. G. Johnston and Mr. E. Forbes ; 
additional references having been made to some foreign works which 
have escaped their researches, or to others which have appeared since 
their publication. 
The British Museum is fortunate in hating received the chief por- 
tion of the specimens from the several authors who originally described 
the species, so that there can be no doubt of the specimens being the 
real representatives of the names they bear ; for besides possessing the 
original specimens collected and described by Colonel George Mon- 
tague and Dr. W. E. Leach ; Dr. G. Johnston of Berwick has most 
kindly presented to the Museum the whole of his Collection, which he 
used in the preparation of his classical work on this subject ; and Mr. 
Edward Forbes has also most kindly presented many of the specimens 
described in his work on the British Echinodermata, and Mr. Mac- 
Andrew has added to these the specimens more recently obtained in 
his dredging expeditions. 
As the attention to the laws of priority, now so universally adhered 
to, has caused the alteration of several names used by Dr. Johnston 
and Mr. E. Forbes, a Concordance showing the changes has been added 
at the end of the List. 
June 12th, 1848. 
JOHN EDWARD GRAY. 
