376 aptera. 
been placed in a new class, aracJi- 
mdes ; and crabs, lobsters, cray fish, 
prawns, centipedes, in shorty the whole 
genus of cancer are now transferred to a 
class, called anistacea. As these ani- 
mals, however, have antennae, palpi, and 
jointed bodies, they were considered by 
Linnaeus as apterous insects ; and as we 
have hitherto followed his classification, 
we may as well include them in our little 
course. 
Lucy, Pray do, mamma ; it will be 
Very pleasant to know something of 
creatures which I see so often. But how 
can such large creatures as crabs and 
lobsters be called insects ? 
Mother. The species with which you are 
acquainted are large, but there are others 
that require a miscroscope to discover 
their structure. The cancri have four 
antenn<e placed below the eyes — six pal- 
pi of unequal lengths, the four longest of 
which cover the mouth — two moveable 
eyes, projecting from the head, and ge- 
