206 
LIFE, IN ITS INTERMEDIATE FORMS. 
among tho number, arranged them under the great class 
Insect a. They have, however, a greater number of limbs ; 
the full provision being five pairs of true feet, and three 
pairs of organs, which (because of a certain ambiguity in 
their function, like that useful piece of furniture of which 
we read — 
" Contrived a double debt to pay, 
A bed by night, a cheat of drawers by day,”)— 
are called foot-jaws. Besides theso, a great number of the 
species have five or sis pairs of jointed limbs attached to 
the under-side of the abdomen, which are generally used 
for progression, and are called J'alse-feet. Their mouth is 
furnished with three pairs of jaws and two pairs of an- 
tenna:. It must be borno in mind, however, that the total 
complement of these members is not found present in 
every species, some of them being wanting in certain 
extensive groups. 
The researches of a naturalist who has paid much atten- , 
