320 ANIMAL REPRODUCTIONS. 
of the lips. The head, as it appears fome time 
after feparation from the trunk, is reprefented 2 — 
little magnified, fig. 1. plate 8. The two large 
horns, gg, are fomewhat contraéted ; the fmall, 
pp, are entirely fhrunk within themfelves. The 
mouth b, is clofely fhut, and the lips are very 
evident there. 3 
A fharp edged knife feems more proper for 
this operation than a {calpel ; fciffars are ftill lefs 
convenient than the latter. I have uniformly 
obferved to make the cut perpendicular to the 
axis of the trunk. 
Immediately after decapitation, the fnail re- 
treats far within its fhell, and in general does 
not appear again. A copious portion of that 
vifcous fluid, with which it is fo amply provided, 
is now diffufed. Some motion is perceptible in 
the horns of the fevered head, and chiefly in the 
larger ; but this very foon ceafes ; and I have in 
wain tried to renew it by ftimulating the head 
near the origin, with a {calpel. All the horns 
contract to a certain degree inftantly on the ope- 
ration, and the fmall contract more than the 
others. 
By a very fimple method, one may afcertain 
whether the operation is complete, namely, by 
immerfing the decapitated {nail in water. It 
quickly leaves the fhell, and extends as much as 
before decollatjion, Then we immediately fee 
| whether 
