102 JELLY-FISII, STAR-FISH, AND SEA-URCHINS. 



ing paralyzed. Hence, before the removal of the 

 lithocyst, the contraction-waves which originated 

 at the point o, no less than those which originated 

 at the lithocyst itself, must in some way or other 

 have been due to the ganglionic influence emanat- 

 ing from the lithocyst and asserting itself at the 

 distant point o. 



Fig. 21. 



This property, which lithocysts sometimes present, 

 of asserting their ganglionic influence at a distance 

 from their own locality, can only, I think, be ex- 

 plained by supposing that at the point where under 

 these circumstances the contractions originate, 

 there are situated some scattered gano-lionic cells of 



