WORMS. .3*21 



other animal. Draparnaud, who paid particu- 

 lar attention to them, says that when young 

 they have only two eyes, and acquire two 

 more when adult. The head has no mouth ; 

 beyond the middle of the body, and on its under 

 side, is a single orifice which serves for mouth, 

 anus, and nostrils. This orifice answers to a 

 long sac, which is the intestinal tube ; from it 

 sometimes issues a white tubular organ, which he 

 regards as respiratory ; this organ is doubtless 

 the same with the retractile trumpet-shaped pro- 

 boscis, issuing from a circular aperture in the 

 middle of the abdomen, mentioned by Dr. Johnson 

 in his interesting paper on these animals in the 

 Philosophical Transactions, which he supposes 

 to be a kind of mouth, when extended, equalling 

 in length the animal itself. 1 This remarkable 

 organ was also noticed by Miiller and Mr. 

 Daly ell. The circumstance of its receiving and 

 extruding its aliment and respiring at the same 

 orifice, is a clear approximation to the polype. 

 A further confirmation of this is the power this 

 animal possesses of spontaneously dividing itself 

 for the purpose of reproduction. M. Drapar- 

 naud after remarking that the species he de- 

 scribed, which he calls P. tentaculata, and which 

 is probably synonymous with that particularly 

 noticed by Dr. Johnson under the name of 



1 Philos. Trans. 1825. i. 254. t. xvl./. 10. 

 VOL. I. Y 



