Is one of the most curious creatures of “the watery kingdom.”  It is popularly termed a fish, though it is, in fact, a worm, belonging to the order termed Mollusca, (Molluscus, soft,) from the body being of a pulpy substance and having no skeleton.  It differs in many respects from other animals of its class, particularly with regard to its internal structure, the perfect formation of the viscera, eyes, and even organs of hearing.  Moreover, “it has three hearts, two of which are placed at the root of the two branchiae (or gills); they receive the blood from the body, and propel it into the branchiae.  The returning veins open into the middle heart, from which the aorta proceeds."[7] Of Cuttle-fish there are several species.  That represented in the annexed Cut is the common or officinal Cuttle-fish, (Sepia officinalis, Lin).  It consists of a soft, pulpy, body, with processes or arms, which are furnished with small holes or suckers, by means of which the animal fixes itself in the manner of cupping-glasses.  These holes increase with the age of the animal; and in some species amount to upwards of one thousand.  The arms are often torn or nipped off by shell or other fishes, but the animal has the power of speedily reproducing the limbs.  By means of the suckers the Cuttle-fish usually affects its locomotion.  “It swims at freedom in the bosom of the sea, moving by sudden and irregular jerks, the body being nearly in a perpendicular position, and the head directed downwards and backwards.  Some species have a fleshy, muscular fin on each side, by aid of which they accomplish these apparently inconvenient motions; but, at least, an equal number of them are finless, and yet can swim with perhaps little less agility.  Lamarck, indeed, denies this, and says that these can only trail themselves along the bottom by means of the suckers.  This is probably their usual mode of proceeding; that it is not their only one, we have the positive affirmation of other observers."[8] Serviceable as these arms undoubtedly are to the Cuttle-fish, Blumenbach thinks it questionable whether they can be considered as organs of touch, in the more limited sense to which he has confined that term.[9]

THE CUTTLE-FISH.

[Illustration:  The Cuttle-fish.]

The jaws of the Cuttle-fish, it should be observed, are fixed in the body because there is no head to which they can be articulated.  They are of horny substance, and resemble the bill of a parrot.  They are in the centre of the under part of the body, surrounded by the arms.  By means of these parts, the shell-fish which are taken for food, are completely triturated.

    [7] Cuvier.

    [8] Nat.  Hist.  Molluscous Animals, Mag.  Nat.  Hist. vol. iii.
        p. 527.

    [9] Manual Comp.  Anat. p. 263.