HABITS AND FACULTIES. ^93 
timber, to the lower surface and crevices of which they 
adhere by a mucous attachment during the day, in hol- 
lows under the roots of trees, and under the layer of 
decaying leaves which cover the ground. In situations 
where such places of shelter are not found, they half 
bury themselves in the soil, at the roots and under the 
shade of thick tufts of plants. Numbers frequently 
resort to the same retreat, but this in the Hdieidas seems 
a mere matter of accident, while in the introduced 
species of Limacidce it appears to indicate a gregarious 
habit, as they prefer to crowd together and lie in close 
contact with and upon each other. 1 These last are said 
by some to occupy permanently the same retreat, but 
the assertion is probably incorrect. They often, and 
perhaps generally, remain in the immediate vicinity of 
the place where they procure their food, and hence they 
often resort to the same place of shelter ; and as many 
of them have frequently been observed in the same 
place, they have been thought to be the same individuals. 
But when one set of individuals is destroyed another 
soon takes their place, and whenever a new shelter is 
provided, by accidentally placing fragments of wood in 
suitable situations, it is immediately resorted to by them. 
The native genus Tebemwphorus is in no manner 2re°-a- 
rious ; it lives in the forest, mostly buried in decaying 
and rotten wood, and no more than two are usually found 
1 The promiscuous mingling of individuals of Liviax agrestis and Umax 
variegatus in their respective retreats has often reminded us of the familiar 
positions i» which swine place themselves for sleep. 
VOL. I. 50 
