1913] 



Gee: Behavior of Leeches 



255 



19. Turn to left. 



20. Local contraction followed by swimming movements. 



21. Local contraction, moved forward. 



22. ^urn to left. 



23. Turn to left and back again to right. 



24. Turn to left. 



25. Turn to right. 



The accompanying table (see table III) does not attempt to 

 show the number and succession of the entire nine responses 

 catalogued as the result of a number of contact stimuli, but only 



Number and Sequence of Right and Left Turns in Twenty-five 

 Stimulations of the Right Side op the Anterior End 



Number of times turned to right in 

 succession at different times 



Number of times turned to left in 

 succession at different times ■ 



Number of times turned to left fol- 

 lowed by turn to left 



Number of individual 



Number of times turned to right fol- 

 lowed bv turn to left .' 



Number of times of complete recoil 

 to left 



* The apparent discrepancy in that the number of responses sometimes totals more 

 than the actual number of stimulations is due to the fact that a turn to the right may fol- 

 low, say two previous turns to the right and itself be followed by a turn to the left. Thus 

 the response would be classified twice. Several such combinations are possible, and it 

 is for this reason that the total number of responses is more than twenty-five in the 

 cases indicated by the asterisk. 



