Argonaut, or Paper Nautlius

“The uppermost figure in the illustration shows the Argonaut in the act of swimming. The extremity of the siphon is seen projecting immediately below the eye, and the reader will at once understand that if the action forcibly ejects water from the tube, the effect will be to drive the animal rapidly in the contrary direction; that is, from right to left, as seen in the engraving. The third figure represents an empty shell, and is given for the purpose of showing the partially spiral and deeply grooved keel, as well as the extreme tenuity of the shell itself.”

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