156 LIFE AND HER CHILDREN. 
word " insect " to those which have wings and six 
legs, yet a good English name is so much wanted 
which will take in centipedes and spiders as well as 
beetles and butterflies, that I shall follow Mr. Ray 
Lankester's suggestion * and call all the ringed and 
jointed-footed animals " Insects." 
In this sense the prawns and their relations which 
are both jointed-footed and cut into parts have been 
called the " Insects of the Sea," and this name helps 
to remind us how much they are like the great body 
of insects on the land. 
This likeness is very evident when we compare 
the four types in Fig. 5 5 . Thus we have first the 
butterfly, whose body you will notice is cut into three 
distinct parts the head with one pair of feelers or 
antenna on its forehead, a pair of eyes on the side of 
the head, and mouth-jaws below ; the thorax, or chest, 
on which grow the six legs and two pair of wings ; 
and the abdomen, or hinder part of the body, which 
never possesses any limbs. The butterfly thus is a 
six-legged winged insect. Then we have the centi- 
pede, whose ringed body reminds us of the caterpillar 
from which the butterfly springs, but which has 
jointed feet on every ring. Next we come to the 
spider, and here we find the head and shoulders 
joined into one strong piece, and bearing four pair of 
legs, while the abdomen has nearly lost the traces 
of rings. The antennae are bent down over the 
forehead, and have been turned, as we shall presently 
see, into pincers, hooks, and poison fangs ; while the 
short feelers in front of the head, which look like 
* Haeckel, History of Creation, English translation, vol. ii. p. 178, 
note. 
