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SUPPLEMENT 
On the habits of the order LiEMomponA, we have nothing 
of any interest to insert. 
On those of the Isopod order, there is but little to add to 
the text. 
We shall first notice Oniscus, the subgenus proper of 
which name is the type of the order, and is composed of the 
little animals commonly called wood-lice, in this country, and 
cloportes in France. 
The name cloportules, or oniscides, is given by M. Latreille 
to a group which comprehends the oniscus of Linnaeus, re- 
spiring the air in an immediate manner, or which have gills, 
analogous, as to their properties, to the lungs of vertebrated 
animals. These Crustacea, with the exception of ligia, are 
all terrestrial, and if plunged into the water, will perish there, 
after a greater or less time. 
The onisci are, in general, very small Crustacea, which sel- 
dom appear during the day. They usually remain in humid 
places, under stones, in the clefts of walls, in cellars, and 
often bury themselves in the earth. They appear to dread 
the light and heat of the sun. They walk slowly ; but when 
they are pursued, they endeavour to save themselves by flight, 
and then they run tolerably fast. 
They feed on different substances, attack and gnaw fruits of 
all kinds which have fallen to the earth, and also eat the 
leaves of plants. Degeer has observed small onisci devour 
a large one of their own species, which had been shut up with 
them, which proves that they are carnivorous. 
The females lay eggs which disclose the young, as it were, 
in their bodies ; they carry them in a sort of oval sac, slender 
and flexible, placed underneath their body, and extending 
from the head towards the fifth pair of feet. When the young 
are entirely formed, to give them a free issue, the mother 
opens the sac, or ovary, in which are formed one longitudinal 
cleft, and three transverse ones; then the little ones issue 
