58 THE PURPLE-OCEAN
marine animals, luminous in the dark, and look, as you have seen, like so many thousands of sparkling gems. There is one little animal of this kind, of which I recollect reading a very interesting account. It is called, the purple-ocean or blue snail-shell; and is plentifully supplied with a juice which is very luminous in the dark."
" Oh ! mamma," said Edward, " do you think if we go down to the beach to-morrow morning, there will be a chance of our finding any ?"
" No, my dear, this little wanderer of the deep never approaches the shore unless it be accidentally. Unlike many other small shell-fish, which attach themselves to rocks, it is furnished with a house that is ex-