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MOLLUSCA.

exeel the thinnest glass. They possess a pair of large membranous fins, which closely resemble the wings of a butterfly, and by using these organs in a flapping manner, the little animals swim briskly about.

PAPER NAUTILUS.

Perhaps some of my readers will expect me to include the beautiful Paper Nautilus (Argonauta), among swimming Mollusks; seeing that the poets have claimed for it the honour of teaching navigation to man:—

"Learn of the little Nautilus to sail, Spread the thin oar, and catch the rising gale."—Pope.

Montgomery, the poet of the ocean, thus beautifully expresses the popular notions concerning it:—