No. 491] 



BEHAVIOR OF GON ION EMUS 



685 



under unilateral stimulation, a reaction observed many times by 

 the writer. The animal is seen to pull the bell out of the light 

 by means of its tentacles. Careful observation shows that the 

 tentacles within the lighted area are not attached, but lie extended 

 and passive. The bell itself is likewise motionless. The case is 

 different with the portion of the bell and its tentacles lying in the 

 shade, as these parts are generally more or less active. It is very 

 improbable that there is any complex coordination here that 



serves to move the body away from an area of light. The action 

 seems to be wholly undirected. This interpretation is strengthened 

 by the fact that, in some cases, the body has been drawn directly 

 into the sunlight by those tentacles l)el()nging to the illuminated 

 side, the tentacles thennelves l„.iti<:- shaded. At other times the 

 tentacles of one side of the ImmIv were <een to he carried up over 

 the bell and to become attaelied to underlying sand on the 

 opposite side of the jelly-fish, after which the animal turned a 



