1920] Taylor: Neuromotor Apparatus in Euplotes 457 



The contractility of cirri or of membranelles is not contingent 

 upon their attachment to the body and consequently not upon any 

 mechanism within the body. 



The normal locomotion of Euplotes patella includes three creeping 

 movements: (1) straight ahead, (2) a quick backward movement, 

 (3) a turn to the right (aborally) ; and six swimming movements: 

 (1) forward without spiral revolutions, (2) forward in spiral revolu- 

 tions, (3) circus movement to the right, (4) circus movement to the 

 left (orally), (5) a sharp turn to the right, (6) rapidly backwards 

 without revolutions. 



It was evident from transections of the body and excision of parts 

 that the frontal cirri or anal cirri are indispensable to normal creeping 

 movements, that the adoral membranelles are largely responsible for 

 swimming movement 3, that the anal cirri function chiefly in per- 

 forming creeping movement 2 and swimming movement 5, and that 

 the adoral membranelles and anal cirri cooperate to effect swimming 

 movement 6. 



Cutting the membranelle fiber results in conspicuous differences in 

 the behavior of the adoral membranelles on either side of the incision 

 and in abnormal spiral revolutions in swimming. 



Severing the anal cirri fibers affects both creeping and swimming. 

 Creeping movement 2 is infrequent. Swimming movement 5 was 

 seldom observed and 6 was never seen after the fibers had been severed. 



Destroying the motorium or cutting its attached fibers; interrupts 

 coordination in tin movements of ttic adoral membranelles and anal 

 cirri. 



• Any incision not severing either the membranelle fiber or the. anal 

 cirri fibers does not impair normal creeping or swimming movements. 



These experimental evidences do not support the assumption that 

 the fibrillar system in Euplotes patella is either contractile or support- 

 ing in function, but they indicate that this complex system of fibers 

 does possess conductive properties functioning in the coordination of 

 the movements of the locomotor organelles with which it is intimately 

 associated. 



