90 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 w^as unable' to follow the distribution of them, in con- 

 sequence of their fineness, their gi'eat 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 Blaiuville, 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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