The antennated Annulata differ materially from those which are
enclosed in a case; they possess, in addition to their antennæ, organs
of motion, like the false legs of a caterpillar, and two or four
well-formed eyes; they are all marine animals, and altogether they bear
a strong resemblance to the _scolopendra_, or centipede.
[Illustration: _Leodice sanguinea._]
The species represented above was taken on the southern coast of
Devonshire; it is the largest English species, extending sometimes to
the length of fourteen or fifteen inches.
When the animal was in a glass of sea-water, the circulation of the
blood through the bristle-like appendages on each side of the body
was a curious object, and appeared to be effected at the will of the
animal, but when it became sickly, the circulation was slower, and as
soon as it expired all the colour from those parts vanished.
The mouth is large, and placed beneath, concealing most formidable
jaws, or complicated fangs, which were put forward occasionally as the
animal became sickly, or in the agonies of death. The figure beneath
the worm shows the shape of this singular apparatus.