10 INTRODUCTION. 
on cotton wool, carefully labelled, have a very attractive 
appearance in a collection. 
The shells of most slugs are covered by the mantle, under 
which the blade of a penknife or scalpel should be inserted 
to effect their removal. Many prefer to kill the animals 
first in boilmg water, and this method recommends itself 
both on the score of humanity and convenience. The shells 
thus extracted may be gummed on to slips of black card. 
Labelling and Registering. 
As soon as possible the shells should be labelled, even if 
they are duplicates, to be stored away for exchange. Both 
the name and locality should be most carefully recorded. 
The collector will do well to keep a register. There are 
various methods of arranging this, but the following has 
commended itself to me as the most practical :—Get a 
good-sized note-book, keep a separate page for each species 
with the name written at the top, and the localities in a 
marginal column. I give a specimen :— 
Cochlicopa tridens. 
Matlock. A few specimens found among moss at the foot of 
; limestone rocks at Matlock Bridge. Sept., 1880. 
Coggeshall. Sparsely among dead leaves. 1881. 
Evesham. Specimens received, coming from Evesham. 1881. 
Marple (Cheshire). A single specimen in moss ona wall. Aug., 1882. 
&e., &e. 
There should be some spare pages at the end of the 
register for occasional notes. For instance, after a district 
has been well worked, a list of all species found in it 
