CHAP. 68. (45.)—BODIES WHICH HAVE A THIRD NATURE, THAT OF THE ANIMAL AND VEGETABLE COMBINED-THE SEA-NETTLE.
Indeed, for my own part, I am strongly of opinion that there
is sense existing in those bodies which have the nature[1] of
neither animals nor vegetables, but a third which partakes of
them both:—sea-nettles and sponges, I mean. The sea-nettle[2]
wanders to and fro by night, and at night changes its locality.
These creatures are by nature a sort of fleshy branch,[3] and are
nurtured upon flesh. They have the power of producing an
itching, smarting pain,[4] just like that caused by the nettle found
on land. For the purpose of seeking its prey, it contracts and
stiffens itself to the utmost possible extent, and then, as a
small fish swims past, it will suddenly spread out its branches,
and so seize and devour[5] it. At another time it will assume
the appearance of being quite withered away, and let itself be
tossed[6] to and fro by the waves like a piece of sea-weed, until
it happens to touch a fish. The moment it does so, the fish
goes to rub itself against a rock, to get rid of the itching; immediately upon which, the nettle pounces upon it. By night
also it is on the look-out for scallops and sea-urchins. When
it perceives a hand approaching it, it instantly changes its
colour, and contracts itself; when touched it produces a
burning sensation, and if ever so short a time is afforded,
makes its escape. Its mouth is situate, it is said, at the root or
lower part,[7] and the excrements[8] are discharged by a small
canal situated above.
1. The zoöphytes, or the zoödendra.
2. The wandering urticæ, or sea-nettles, are the Medusæ of Linnæus;
the stationary nettle is the Actinia of the same naturalist.
3. "Camosæ frondis his natura."
4. Many species of the medusæ, Cuvier says, and other animals of the
same class, the physalus more especially, cause an itching sensation in the
skin when they are touched. This is noticed also by Ælian, Hist. Anim.
B. vii. c. 35; and by Diphilus of Siphnos, in Athenæus, B. iii.
5. This is true, Cuvier says, and more especially with reference to the
actiniæ. They have the mouth provided with numerous fleshy tentacles,
by means of which they can seize very small animals which come within
their reach, which they instantly swallow.
6. Cuvier says, that this is the case more especially with the medusæ
and the physali.
7. "Ora ei in radice." Aristotle, however, says, fist. Anim. B. iv. c. 5,
and B. viii. c. 3, that the sea-nettle has the mouth situate e)n me/sw|, "in the
middle of the body." Hardouin attempts to explain the passage on the
ground that Pliny has made a mistake, in an endeavour to suit his similitude
of a tree to the language of Aristotle. Cuvier says, that there exists one
genus or species of the medusæ, which appears to feed itself by the aid of
an apparatus of branches, and is divided into such a multitude of filaments,
almost innumerable, that it bears a strong resemblance to the roots of a
tree or vegetable. It is this kind, he says, that he has called by the name
of "Rhizostomos."
8. Aristotle, Hist. Anim. B. viii. c. 3, says the same; though, on the
other hand, in the Fourth Book, he says that the animal has no excrements,
although it has a mouth, and feeds.