68 PLANARIA FELINA. 



when nothing except the shghtest indica- 

 tion of a scar was perceptible. But with 

 regard to the third, it was evident, after a 

 certain period, that the lower part of the 

 incision had not healed, as in the others. 

 An unnatural prominence interrupted the 

 general contour of the side, which continued 

 protruding into something unlike any or- 

 ganization peculiar to planariae. Its pro- 

 gress advanced ; the outline was more and 

 Inore impaired, and at length, about the 

 twenty-fifth of October, nearly four weeks 

 after the operation, the superfluous repro- 

 duction was clearly recognized to be the 

 rudiments of a new head. The order of 

 the experiment, however, was now disturb- 

 ed ; for the original head had separated 

 close to the neck, by spontaneous division, 

 and remained independent of it. A doubt 

 might thence have arose, — would the new 

 and superfluous organ springing from the 

 under part of the incision, supply the place 

 of that which had just been lost, or would 

 a head, the third in number, including the 



