160 LIFE AND HER CHILDREN. 
which live in the sea, for not only are there strange 
forms of all kinds on distant shores, but there are 
oceanic crabs which swim in the open sea for days 
without resting, just as the albatross flies over it, 
while smaller crustaceans swarm under the ice in 
the Arctic regions, and there is scarcely a fish which 
has not an animal of this class living on some part 
of its body. 
Of all the many forms, however, there is probably 
not one more beautiful than the delicate transparent 
prawn as he paddles along lazily in sea pools, or 
through the still water of an aquarium. His horny 
Fig s6> skeleton is so clear 
and glass-like, that it 
looks like crystal, while 
the formidable toothed 
saw protectinghis head, 
is scarcely visible in 
the water, and his 
delicate antennae and 
tapering limbs look as 
Common Prawn. . r , , , 
if they would snap at 
a, Large antennae ; a 2 , antennules or , . , 
small antenna; b, front leg, with small a touch. AS he SWims 
claw bearing a brush; t, carapace you will notice that it 
j i u u u' 2. ' i '* is not his ten. true lesrs 
ringed abdomen ; S, swimmerets ; t, in the front part of his 
body which row him 
along, but the little hairy swimmerets, S, which lie under 
the hinder part or abdomen, while if anything alarms 
him, he darts rapidly backwards by a smart stroke 
of his fan-like tail, t. His long antennae or feelers, a, 
are streaming over his back, while a pair of shorter 
antennae or antennules (a 2 } as these are called, each 
