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.
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