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SUPPLEMENT 
a vascular system, by many vessels which proceeded from the 
intestine to the cutaneous envelope, and from the latter to the 
former, and especially towards the bladder, and the hepatic 
mass of the upper oesophagus, and under the large intestine ; 
but he was unable to follow the distribution of them, in con- 
sequence of their fineness, their great number, and their colour 
being yellow throughout. 
The nervous system consists in a filament extended from 
one extremity to the other of the middle ventral line, and 
swelling into a ganglion, giving out filaments for each articu- 
lation. The first appeared thicker than the others ; accord- 
ingly, the nerves which it furnishes for the sides of the head 
are thicker. 
The S. diplochaites thus named by Dr. Otto, on account 
of the double series of setae with which its body is furnished, 
was found by him in tolerable abundance on the coast of 
Naples, cast ashore by a tempest, but dead. At other times 
the fishermen brought him living specimens in their nets. 
We have followed his mode of considering this animal; but 
might it not be possible, says M. de Blainville, that he took 
one extremity for the other, and that the two orifices, which 
he considered as mouths, were one of them, the inferior, the 
anus, and the other, the superior, the orifice of the generative 
apparatus ? The direction of the setae would seem to favour 
this opinion, and then the extraordinary anomaly of an ani- 
mal with a double mouth would vanish. 
The Dentalium is a genus of animals probably articu- 
lated, and belonging to this class, but rather imperfectly 
known, and the classification, as our author observes, is 
doubtful. The body is a little conical, terminated behind by 
a sort of basement, which issues from the tube, and superiorly 
by a cephalic enlargement, in the middle of which is found 
the mouth, at the extremity of a sort of button, and having at 
its base a frill, the nature of which is unknown, but which 
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