-26- 



polarity of sea anemone tentacle (Psrliser 191$) in that when 

 stimulated at the base or middle, th* musculature, especially 

 the circular musculature, below (proximal to) the locus of 

 stimulation contract^ while that above (distal) dt>e$ not contract. 

 If stimulated at the tip the whole tentacle contracts, the 

 circular musculature responding to a lesser stimulation than the 

 longitudinal. If out off at the base with scissors, the 

 edges of both the stump and the ablated piece adhere together 

 along the line of the out by means, seemingly, of a sticky 

 substance on or near the cut edges, so that the wound does not 

 open an ^pJJ&rKture to the exterior. The stumps of course 

 shrivel down in strong contraction. They are found, three days 

 later a little short but with the end healed over normally. 

 The excised gills show no sign of contraction, and the cut end 

 being sealed over as describedabove, the gill remains distended 

 by its enclosed watef like a miniature "sausage balloon" with 

 a trun^a^ed end. The contraction of the gill musculature is not 

 sufficient to collapse the gill against the resistance of the 

 closed end. If this end be teased open gently and then the tip 

 be stimulated collapse ensues immediately* 



Ciliary currents in frills. 



J 

 One of the gills, when thus removed was seen to en&ose 



several clumps of amoebocytes or wandering cells. These made it 

 convenient to see the ciliary respiratory current which continued 

 uninterruptedly after the gill had been removed. The amoebocytes 

 moved up one side to the tip of the excised gill and down the 

 other side to the base* It took three or four seconds to complete 

 the circuit. 



Coordination that involves some orientation of, the tube feet. 



Having studied the coordination of the non-looomotor tube 



if 

 feet and compared #*a-fcwith coordination of the gills we shall 



