88 
A P T £ R A. 
> 
The fhell opens underneath ; the infe£fc puts forth its 
antennae, by means of which it fwims very expediti- 
oully in various direftions, feeking afolidbody to ad¬ 
here to; and then it is it ufes its feet in walking, by 
ftretching them out through the apirture of the 
(he 11, 
Their encreafe is prodigious and rapid ; a glafs full 
of water became in a fortnight a mafs of animated mat¬ 
ter of various colours ; and this from a fingle pair. 
GENUS 12.—ONISCUS. 
The onifci change their fkins like- many other ap¬ 
terous in lefts ; it is compofed of feveral cruftaceous 
They are found in houfes, gardens, and woods ; 
fome fpecies live in the water ; they are fometimes 
called hog-lice, and one fpecies is made ufe of in medi¬ 
cine fonifcus afellusJ ; one is called armadillo, becaufe 
it rolls up. 
Onifcus Aquaticus. 
This is found in pools, fmall rivulets, and efpeci- 
ally in fprings, fome in the fea. They fwim well; 
are viviparous, the land ones oviparous. 
GENUS 13.—SCOLOPENDRA. 
The body of the Scolopendra is flat ; and com¬ 
pofed of a great many rings or fegments, which aug¬ 
ment as the infeft advances in age, till it is fully 
* ' grown 1 
