268 Transactions of the Society. 



peculiar organs looking like flagellate cells, the nature of which 

 I cannot determine, if the} 7- do not belong to the water vascular 

 system." 



I have since that time found them in the living animal. 



I wanted to find out whether these flagellate cells acted in 

 unison with any other portion of the organism, and whether the 

 movements were uniform and constant or otherwise. The motion 

 of the foot from side to side prevented any satisfactory examina- 

 tion, but this much was clear, that the movements of these cells 

 were similar to those of vibratile tags, and I would say strikingly so. 



The Eotifer described as Mastigocerca carinata in my last 

 paper, with a double ridge nearly half way down its back, I now 

 see is Rattuhis mucosus Stokes, according to Professor Jenning's 

 Monograph of the Rattulidse. 



