PRE PAG E 
TO THE 
SECOND DITION: 
HE very favourable reception which the first edition of this little 
work received has encouraged me to undertake a second, and 
I venture to hope that the care bestowed upon the thorough revision, 
or rather re-writing of the whole and bringing it up to date has not 
been thrown away. 
It is to be regretted that, of necessity, many oi the old familiar 
names—almost household words that call up so many associations— 
have to give way to others by the inexorable law of priority, but it is 
to be hoped that the present system of nomenclature is now fairly 
crystallized. I know I have laid myself open to criticism by including 
sO many varietal names, but as it is impossible to satisfy both 
‘splitters’ and ‘lumpers,’ I have taken the latest list of the Con- 
chological Society of Great Britain and Ireland as fairly enumerating 
those names which are current among British conchologists. It is, 
besides, at the option of anyone to disregard those which seem to him 
superfluous. 
I have the greatest pleasure in acknowledging the able and 
cordial assistance that I have received from many friends and 
correspondents. To the referees of the Conchological Society I am 
indebted for permission to print the ‘ Census’ brought up to the date 
of publication. For the ever ready help with facts, opinions, and 
references that I have received from my friend Mr. J. W. Taylor my 
obligation is especially great, and I am under particular obligations to 
my friend Mr. W. Denison Roebuck for the assistance he has given 
me during the last ten years in the study of slugs. 
